Merging upstream version 6.7.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

20 files changed, 2244 insertions, 81 deletions

diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore
index cdc9ce4426..4ff10ea614 100644
--- a/tools/testing/selftests/mm/.gitignore
+++ b/tools/testing/selftests/mm/.gitignore
@@ -18,6 +18,8 @@ mremap_dontunmap
 mremap_test
 on-fault-limit
 transhuge-stress
+pagemap_ioctl
+*.tmp*
 protection_keys
 protection_keys_32
 protection_keys_64
@@ -43,3 +45,4 @@ mdwe_test
 gup_longterm
 mkdirty
 va_high_addr_switch
+hugetlb_fault_after_madv
diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index 6a9fc56931..dede0bcf97 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -33,7 +33,7 @@ endif
 MAKEFLAGS += --no-builtin-rules
 
 CFLAGS = -Wall -I $(top_srcdir) $(EXTRA_CFLAGS) $(KHDR_INCLUDES)
-LDLIBS = -lrt -lpthread
+LDLIBS = -lrt -lpthread -lm
 
 TEST_GEN_FILES = cow
 TEST_GEN_FILES += compaction_test
@@ -60,6 +60,7 @@ TEST_GEN_FILES += mrelease_test
 TEST_GEN_FILES += mremap_dontunmap
 TEST_GEN_FILES += mremap_test
 TEST_GEN_FILES += on-fault-limit
+TEST_GEN_FILES += pagemap_ioctl
 TEST_GEN_FILES += thuge-gen
 TEST_GEN_FILES += transhuge-stress
 TEST_GEN_FILES += uffd-stress
@@ -68,9 +69,10 @@ TEST_GEN_FILES += split_huge_page_test
 TEST_GEN_FILES += ksm_tests
 TEST_GEN_FILES += ksm_functional_tests
 TEST_GEN_FILES += mdwe_test
+TEST_GEN_FILES += hugetlb_fault_after_madv
 
 ifneq ($(ARCH),arm64)
-TEST_GEN_PROGS += soft-dirty
+TEST_GEN_FILES += soft-dirty
 endif
 
 ifeq ($(ARCH),x86_64)
diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh
index 0899019a7f..e14bdd4455 100755
--- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh
+++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
 # Kselftest framework requirement - SKIP code is 4.
diff --git a/tools/testing/selftests/mm/config b/tools/testing/selftests/mm/config
index be087c4bc3..4309916f62 100644
--- a/tools/testing/selftests/mm/config
+++ b/tools/testing/selftests/mm/config
@@ -1,5 +1,6 @@
 CONFIG_SYSVIPC=y
 CONFIG_USERFAULTFD=y
+CONFIG_PTE_MARKER_UFFD_WP=y
 CONFIG_TEST_VMALLOC=m
 CONFIG_DEVICE_PRIVATE=y
 CONFIG_TEST_HMM=m
diff --git a/tools/testing/selftests/mm/gup_longterm.c b/tools/testing/selftests/mm/gup_longterm.c
index d33d3e68ff..ad168d35b2 100644
--- a/tools/testing/selftests/mm/gup_longterm.c
+++ b/tools/testing/selftests/mm/gup_longterm.c
@@ -265,10 +265,11 @@ static void run_with_tmpfile(test_fn fn, const char *desc)
 	fd = fileno(file);
 	if (fd < 0) {
 		ksft_test_result_fail("fileno() failed\n");
-		return;
+		goto close;
 	}
 
 	fn(fd, pagesize);
+close:
 	fclose(file);
 }
 
diff --git a/tools/testing/selftests/mm/hugetlb-madvise.c b/tools/testing/selftests/mm/hugetlb-madvise.c
index d55322df4b..f32d99565c 100644
--- a/tools/testing/selftests/mm/hugetlb-madvise.c
+++ b/tools/testing/selftests/mm/hugetlb-madvise.c
@@ -36,25 +36,6 @@
 unsigned long huge_page_size;
 unsigned long base_page_size;
 
-unsigned long get_free_hugepages(void)
-{
-	unsigned long fhp = 0;
-	char *line = NULL;
-	size_t linelen = 0;
-	FILE *f = fopen("/proc/meminfo", "r");
-
-	if (!f)
-		return fhp;
-	while (getline(&line, &linelen, f) > 0) {
-		if (sscanf(line, "HugePages_Free:      %lu", &fhp) == 1)
-			break;
-	}
-
-	free(line);
-	fclose(f);
-	return fhp;
-}
-
 void write_fault_pages(void *addr, unsigned long nr_pages)
 {
 	unsigned long i;
diff --git a/tools/testing/selftests/mm/hugetlb_fault_after_madv.c b/tools/testing/selftests/mm/hugetlb_fault_after_madv.c
new file mode 100644
index 0000000000..73b81c6323
--- /dev/null
+++ b/tools/testing/selftests/mm/hugetlb_fault_after_madv.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "vm_util.h"
+#include "../kselftest.h"
+
+#define MMAP_SIZE (1 << 21)
+#define INLOOP_ITER 100
+
+char *huge_ptr;
+
+/* Touch the memory while it is being madvised() */
+void *touch(void *unused)
+{
+	char *ptr = (char *)huge_ptr;
+
+	for (int i = 0; i < INLOOP_ITER; i++)
+		ptr[0] = '.';
+
+	return NULL;
+}
+
+void *madv(void *unused)
+{
+	usleep(rand() % 10);
+
+	for (int i = 0; i < INLOOP_ITER; i++)
+		madvise(huge_ptr, MMAP_SIZE, MADV_DONTNEED);
+
+	return NULL;
+}
+
+int main(void)
+{
+	unsigned long free_hugepages;
+	pthread_t thread1, thread2;
+	/*
+	 * On kernel 6.4, we are able to reproduce the problem with ~1000
+	 * interactions
+	 */
+	int max = 10000;
+
+	srand(getpid());
+
+	free_hugepages = get_free_hugepages();
+	if (free_hugepages != 1) {
+		ksft_exit_skip("This test needs one and only one page to execute. Got %lu\n",
+			       free_hugepages);
+	}
+
+	while (max--) {
+		huge_ptr = mmap(NULL, MMAP_SIZE, PROT_READ | PROT_WRITE,
+				MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
+				-1, 0);
+
+		if ((unsigned long)huge_ptr == -1)
+			ksft_exit_skip("Failed to allocated huge page\n");
+
+		pthread_create(&thread1, NULL, madv, NULL);
+		pthread_create(&thread2, NULL, touch, NULL);
+
+		pthread_join(thread1, NULL);
+		pthread_join(thread2, NULL);
+		munmap(huge_ptr, MMAP_SIZE);
+	}
+
+	return KSFT_PASS;
+}
diff --git a/tools/testing/selftests/mm/ksm_functional_tests.c b/tools/testing/selftests/mm/ksm_functional_tests.c
index 901e950f91..fbff0dd091 100644
--- a/tools/testing/selftests/mm/ksm_functional_tests.c
+++ b/tools/testing/selftests/mm/ksm_functional_tests.c
@@ -26,6 +26,7 @@
 
 #define KiB 1024u
 #define MiB (1024 * KiB)
+#define FORK_EXEC_CHILD_PRG_NAME "ksm_fork_exec_child"
 
 static int mem_fd;
 static int ksm_fd;
@@ -479,6 +480,64 @@ static void test_prctl_fork(void)
 	ksft_test_result_pass("PR_SET_MEMORY_MERGE value is inherited\n");
 }
 
+static int ksm_fork_exec_child(void)
+{
+	/* Test if KSM is enabled for the process. */
+	return prctl(PR_GET_MEMORY_MERGE, 0, 0, 0, 0) == 1;
+}
+
+static void test_prctl_fork_exec(void)
+{
+	int ret, status;
+	pid_t child_pid;
+
+	ksft_print_msg("[RUN] %s\n", __func__);
+
+	ret = prctl(PR_SET_MEMORY_MERGE, 1, 0, 0, 0);
+	if (ret < 0 && errno == EINVAL) {
+		ksft_test_result_skip("PR_SET_MEMORY_MERGE not supported\n");
+		return;
+	} else if (ret) {
+		ksft_test_result_fail("PR_SET_MEMORY_MERGE=1 failed\n");
+		return;
+	}
+
+	child_pid = fork();
+	if (child_pid == -1) {
+		ksft_test_result_skip("fork() failed\n");
+		return;
+	} else if (child_pid == 0) {
+		char *prg_name = "./ksm_functional_tests";
+		char *argv_for_program[] = { prg_name, FORK_EXEC_CHILD_PRG_NAME };
+
+		execv(prg_name, argv_for_program);
+		return;
+	}
+
+	if (waitpid(child_pid, &status, 0) > 0) {
+		if (WIFEXITED(status)) {
+			status = WEXITSTATUS(status);
+			if (status) {
+				ksft_test_result_fail("KSM not enabled\n");
+				return;
+			}
+		} else {
+			ksft_test_result_fail("program didn't terminate normally\n");
+			return;
+		}
+	} else {
+		ksft_test_result_fail("waitpid() failed\n");
+		return;
+	}
+
+	if (prctl(PR_SET_MEMORY_MERGE, 0, 0, 0, 0)) {
+		ksft_test_result_fail("PR_SET_MEMORY_MERGE=0 failed\n");
+		return;
+	}
+
+	ksft_test_result_pass("PR_SET_MEMORY_MERGE value is inherited\n");
+}
+
 static void test_prctl_unmerge(void)
 {
 	const unsigned int size = 2 * MiB;
@@ -536,9 +595,13 @@ unmap:
 
 int main(int argc, char **argv)
 {
-	unsigned int tests = 7;
+	unsigned int tests = 8;
 	int err;
 
+	if (argc > 1 && !strcmp(argv[1], FORK_EXEC_CHILD_PRG_NAME)) {
+		exit(ksm_fork_exec_child() == 1 ? 0 : 1);
+	}
+
 #ifdef __NR_userfaultfd
 	tests++;
 #endif
@@ -576,6 +639,7 @@ int main(int argc, char **argv)
 
 	test_prctl();
 	test_prctl_fork();
+	test_prctl_fork_exec();
 	test_prctl_unmerge();
 
 	err = ksft_get_fail_cnt();
diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c
index 380b691d3e..b748c48908 100644
--- a/tools/testing/selftests/mm/ksm_tests.c
+++ b/tools/testing/selftests/mm/ksm_tests.c
@@ -566,7 +566,7 @@ static int ksm_merge_hugepages_time(int merge_type, int mapping, int prot,
 	if (map_ptr_orig == MAP_FAILED)
 		err(2, "initial mmap");
 
-	if (madvise(map_ptr, len + HPAGE_SIZE, MADV_HUGEPAGE))
+	if (madvise(map_ptr, len, MADV_HUGEPAGE))
 		err(2, "MADV_HUGEPAGE");
 
 	pagemap_fd = open("/proc/self/pagemap", O_RDONLY);
diff --git a/tools/testing/selftests/mm/map_hugetlb.c b/tools/testing/selftests/mm/map_hugetlb.c
index 193281560b..86e8f2048a 100644
--- a/tools/testing/selftests/mm/map_hugetlb.c
+++ b/tools/testing/selftests/mm/map_hugetlb.c
@@ -15,6 +15,7 @@
 #include <unistd.h>
 #include <sys/mman.h>
 #include <fcntl.h>
+#include "vm_util.h"
 
 #define LENGTH (256UL*1024*1024)
 #define PROTECTION (PROT_READ | PROT_WRITE)
@@ -58,10 +59,16 @@ int main(int argc, char **argv)
 {
 	void *addr;
 	int ret;
+	size_t hugepage_size;
 	size_t length = LENGTH;
 	int flags = FLAGS;
 	int shift = 0;
 
+	hugepage_size = default_huge_page_size();
+	/* munmap with fail if the length is not page aligned */
+	if (hugepage_size > length)
+		length = hugepage_size;
+
 	if (argc > 1)
 		length = atol(argv[1]) << 20;
 	if (argc > 2) {
diff --git a/tools/testing/selftests/mm/mdwe_test.c b/tools/testing/selftests/mm/mdwe_test.c
index 0c5e469ae3..200bedcdc3 100644
--- a/tools/testing/selftests/mm/mdwe_test.c
+++ b/tools/testing/selftests/mm/mdwe_test.c
@@ -22,15 +22,104 @@
 
 TEST(prctl_flags)
 {
+	EXPECT_LT(prctl(PR_SET_MDWE, PR_MDWE_NO_INHERIT, 0L, 0L, 7L), 0);
+	EXPECT_EQ(errno, EINVAL);
+
 	EXPECT_LT(prctl(PR_SET_MDWE, 7L, 0L, 0L, 0L), 0);
+	EXPECT_EQ(errno, EINVAL);
 	EXPECT_LT(prctl(PR_SET_MDWE, 0L, 7L, 0L, 0L), 0);
+	EXPECT_EQ(errno, EINVAL);
 	EXPECT_LT(prctl(PR_SET_MDWE, 0L, 0L, 7L, 0L), 0);
+	EXPECT_EQ(errno, EINVAL);
 	EXPECT_LT(prctl(PR_SET_MDWE, 0L, 0L, 0L, 7L), 0);
+	EXPECT_EQ(errno, EINVAL);
 
 	EXPECT_LT(prctl(PR_GET_MDWE, 7L, 0L, 0L, 0L), 0);
+	EXPECT_EQ(errno, EINVAL);
 	EXPECT_LT(prctl(PR_GET_MDWE, 0L, 7L, 0L, 0L), 0);
+	EXPECT_EQ(errno, EINVAL);
 	EXPECT_LT(prctl(PR_GET_MDWE, 0L, 0L, 7L, 0L), 0);
+	EXPECT_EQ(errno, EINVAL);
 	EXPECT_LT(prctl(PR_GET_MDWE, 0L, 0L, 0L, 7L), 0);
+	EXPECT_EQ(errno, EINVAL);
+}
+
+FIXTURE(consecutive_prctl_flags) {};
+FIXTURE_SETUP(consecutive_prctl_flags) {}
+FIXTURE_TEARDOWN(consecutive_prctl_flags) {}
+
+FIXTURE_VARIANT(consecutive_prctl_flags)
+{
+	unsigned long first_flags;
+	unsigned long second_flags;
+	bool should_work;
+};
+
+FIXTURE_VARIANT_ADD(consecutive_prctl_flags, can_keep_no_flags)
+{
+	.first_flags = 0,
+	.second_flags = 0,
+	.should_work = true,
+};
+
+FIXTURE_VARIANT_ADD(consecutive_prctl_flags, can_keep_exec_gain)
+{
+	.first_flags = PR_MDWE_REFUSE_EXEC_GAIN,
+	.second_flags = PR_MDWE_REFUSE_EXEC_GAIN,
+	.should_work = true,
+};
+
+FIXTURE_VARIANT_ADD(consecutive_prctl_flags, can_keep_both_flags)
+{
+	.first_flags = PR_MDWE_REFUSE_EXEC_GAIN | PR_MDWE_NO_INHERIT,
+	.second_flags = PR_MDWE_REFUSE_EXEC_GAIN | PR_MDWE_NO_INHERIT,
+	.should_work = true,
+};
+
+FIXTURE_VARIANT_ADD(consecutive_prctl_flags, cant_disable_mdwe)
+{
+	.first_flags = PR_MDWE_REFUSE_EXEC_GAIN,
+	.second_flags = 0,
+	.should_work = false,
+};
+
+FIXTURE_VARIANT_ADD(consecutive_prctl_flags, cant_disable_mdwe_no_inherit)
+{
+	.first_flags = PR_MDWE_REFUSE_EXEC_GAIN | PR_MDWE_NO_INHERIT,
+	.second_flags = 0,
+	.should_work = false,
+};
+
+FIXTURE_VARIANT_ADD(consecutive_prctl_flags, cant_disable_no_inherit)
+{
+	.first_flags = PR_MDWE_REFUSE_EXEC_GAIN | PR_MDWE_NO_INHERIT,
+	.second_flags = PR_MDWE_REFUSE_EXEC_GAIN,
+	.should_work = false,
+};
+
+FIXTURE_VARIANT_ADD(consecutive_prctl_flags, cant_enable_no_inherit)
+{
+	.first_flags = PR_MDWE_REFUSE_EXEC_GAIN,
+	.second_flags = PR_MDWE_REFUSE_EXEC_GAIN | PR_MDWE_NO_INHERIT,
+	.should_work = false,
+};
+
+TEST_F(consecutive_prctl_flags, two_prctls)
+{
+	int ret;
+
+	EXPECT_EQ(prctl(PR_SET_MDWE, variant->first_flags, 0L, 0L, 0L), 0);
+
+	ret = prctl(PR_SET_MDWE, variant->second_flags, 0L, 0L, 0L);
+	if (variant->should_work) {
+		EXPECT_EQ(ret, 0);
+
+		ret = prctl(PR_GET_MDWE, 0L, 0L, 0L, 0L);
+		ASSERT_EQ(ret, variant->second_flags);
+	} else {
+		EXPECT_NE(ret, 0);
+		ASSERT_EQ(errno, EPERM);
+	}
 }
 
 FIXTURE(mdwe)
@@ -45,28 +134,45 @@ FIXTURE_VARIANT(mdwe)
 {
 	bool enabled;
 	bool forked;
+	bool inherit;
 };
 
 FIXTURE_VARIANT_ADD(mdwe, stock)
 {
-        .enabled = false,
+	.enabled = false,
 	.forked = false,
+	.inherit = false,
 };
 
 FIXTURE_VARIANT_ADD(mdwe, enabled)
 {
-        .enabled = true,
+	.enabled = true,
 	.forked = false,
+	.inherit = true,
 };
 
-FIXTURE_VARIANT_ADD(mdwe, forked)
+FIXTURE_VARIANT_ADD(mdwe, inherited)
 {
-        .enabled = true,
+	.enabled = true,
 	.forked = true,
+	.inherit = true,
 };
 
+FIXTURE_VARIANT_ADD(mdwe, not_inherited)
+{
+	.enabled = true,
+	.forked = true,
+	.inherit = false,
+};
+
+static bool executable_map_should_fail(const FIXTURE_VARIANT(mdwe) *variant)
+{
+	return variant->enabled && (!variant->forked || variant->inherit);
+}
+
 FIXTURE_SETUP(mdwe)
 {
+	unsigned long mdwe_flags;
 	int ret, status;
 
 	self->p = NULL;
@@ -76,13 +182,17 @@ FIXTURE_SETUP(mdwe)
 	if (!variant->enabled)
 		return;
 
-	ret = prctl(PR_SET_MDWE, PR_MDWE_REFUSE_EXEC_GAIN, 0L, 0L, 0L);
+	mdwe_flags = PR_MDWE_REFUSE_EXEC_GAIN;
+	if (!variant->inherit)
+		mdwe_flags |= PR_MDWE_NO_INHERIT;
+
+	ret = prctl(PR_SET_MDWE, mdwe_flags, 0L, 0L, 0L);
 	ASSERT_EQ(ret, 0) {
 		TH_LOG("PR_SET_MDWE failed or unsupported");
 	}
 
 	ret = prctl(PR_GET_MDWE, 0L, 0L, 0L, 0L);
-	ASSERT_EQ(ret, 1);
+	ASSERT_EQ(ret, mdwe_flags);
 
 	if (variant->forked) {
 		self->pid = fork();
@@ -113,7 +223,7 @@ TEST_F(mdwe, mmap_READ_EXEC)
 TEST_F(mdwe, mmap_WRITE_EXEC)
 {
 	self->p = mmap(NULL, self->size, PROT_WRITE | PROT_EXEC, self->flags, 0, 0);
-	if (variant->enabled) {
+	if (executable_map_should_fail(variant)) {
 		EXPECT_EQ(self->p, MAP_FAILED);
 	} else {
 		EXPECT_NE(self->p, MAP_FAILED);
@@ -139,7 +249,7 @@ TEST_F(mdwe, mprotect_add_EXEC)
 	ASSERT_NE(self->p, MAP_FAILED);
 
 	ret = mprotect(self->p, self->size, PROT_READ | PROT_EXEC);
-	if (variant->enabled) {
+	if (executable_map_should_fail(variant)) {
 		EXPECT_LT(ret, 0);
 	} else {
 		EXPECT_EQ(ret, 0);
@@ -154,7 +264,7 @@ TEST_F(mdwe, mprotect_WRITE_EXEC)
 	ASSERT_NE(self->p, MAP_FAILED);
 
 	ret = mprotect(self->p, self->size, PROT_WRITE | PROT_EXEC);
-	if (variant->enabled) {
+	if (executable_map_should_fail(variant)) {
 		EXPECT_LT(ret, 0);
 	} else {
 		EXPECT_EQ(ret, 0);
diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index 5c3773de9f..1d4c1589c3 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -23,12 +23,15 @@
 #define VALIDATION_NO_THRESHOLD 0	/* Verify the entire region */
 
 #define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
+#define SIZE_MB(m) ((size_t)m * (1024 * 1024))
+#define SIZE_KB(k) ((size_t)k * 1024)
 
 struct config {
 	unsigned long long src_alignment;
 	unsigned long long dest_alignment;
 	unsigned long long region_size;
 	int overlapping;
+	int dest_preamble_size;
 };
 
 struct test {
@@ -44,6 +47,7 @@ enum {
 	_1MB = 1ULL << 20,
 	_2MB = 2ULL << 20,
 	_4MB = 4ULL << 20,
+	_5MB = 5ULL << 20,
 	_1GB = 1ULL << 30,
 	_2GB = 2ULL << 30,
 	PMD = _2MB,
@@ -146,6 +150,60 @@ static bool is_range_mapped(FILE *maps_fp, void *start, void *end)
 }
 
 /*
+ * Returns the start address of the mapping on success, else returns
+ * NULL on failure.
+ */
+static void *get_source_mapping(struct config c)
+{
+	unsigned long long addr = 0ULL;
+	void *src_addr = NULL;
+	unsigned long long mmap_min_addr;
+
+	mmap_min_addr = get_mmap_min_addr();
+	/*
+	 * For some tests, we need to not have any mappings below the
+	 * source mapping. Add some headroom to mmap_min_addr for this.
+	 */
+	mmap_min_addr += 10 * _4MB;
+
+retry:
+	addr += c.src_alignment;
+	if (addr < mmap_min_addr)
+		goto retry;
+
+	src_addr = mmap((void *) addr, c.region_size, PROT_READ | PROT_WRITE,
+					MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED,
+					-1, 0);
+	if (src_addr == MAP_FAILED) {
+		if (errno == EPERM || errno == EEXIST)
+			goto retry;
+		goto error;
+	}
+	/*
+	 * Check that the address is aligned to the specified alignment.
+	 * Addresses which have alignments that are multiples of that
+	 * specified are not considered valid. For instance, 1GB address is
+	 * 2MB-aligned, however it will not be considered valid for a
+	 * requested alignment of 2MB. This is done to reduce coincidental
+	 * alignment in the tests.
+	 */
+	if (((unsigned long long) src_addr & (c.src_alignment - 1)) ||
+			!((unsigned long long) src_addr & c.src_alignment)) {
+		munmap(src_addr, c.region_size);
+		goto retry;
+	}
+
+	if (!src_addr)
+		goto error;
+
+	return src_addr;
+error:
+	ksft_print_msg("Failed to map source region: %s\n",
+			strerror(errno));
+	return NULL;
+}
+
+/*
  * This test validates that merge is called when expanding a mapping.
  * Mapping containing three pages is created, middle page is unmapped
  * and then the mapping containing the first page is expanded so that
@@ -225,59 +283,83 @@ out:
 }
 
 /*
- * Returns the start address of the mapping on success, else returns
- * NULL on failure.
+ * Verify that an mremap within a range does not cause corruption
+ * of unrelated part of range.
+ *
+ * Consider the following range which is 2MB aligned and is
+ * a part of a larger 20MB range which is not shown. Each
+ * character is 256KB below making the source and destination
+ * 2MB each. The lower case letters are moved (s to d) and the
+ * upper case letters are not moved. The below test verifies
+ * that the upper case S letters are not corrupted by the
+ * adjacent mremap.
+ *
+ * |DDDDddddSSSSssss|
  */
-static void *get_source_mapping(struct config c)
+static void mremap_move_within_range(char pattern_seed)
 {
-	unsigned long long addr = 0ULL;
-	void *src_addr = NULL;
-	unsigned long long mmap_min_addr;
+	char *test_name = "mremap mremap move within range";
+	void *src, *dest;
+	int i, success = 1;
+
+	size_t size = SIZE_MB(20);
+	void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
+			 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+	if (ptr == MAP_FAILED) {
+		perror("mmap");
+		success = 0;
+		goto out;
+	}
+	memset(ptr, 0, size);
 
-	mmap_min_addr = get_mmap_min_addr();
+	src = ptr + SIZE_MB(6);
+	src = (void *)((unsigned long)src & ~(SIZE_MB(2) - 1));
 
-retry:
-	addr += c.src_alignment;
-	if (addr < mmap_min_addr)
-		goto retry;
+	/* Set byte pattern for source block. */
+	srand(pattern_seed);
+	for (i = 0; i < SIZE_MB(2); i++) {
+		((char *)src)[i] = (char) rand();
+	}
 
-	src_addr = mmap((void *) addr, c.region_size, PROT_READ | PROT_WRITE,
-					MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED,
-					-1, 0);
-	if (src_addr == MAP_FAILED) {
-		if (errno == EPERM || errno == EEXIST)
-			goto retry;
-		goto error;
+	dest = src - SIZE_MB(2);
+
+	void *new_ptr = mremap(src + SIZE_MB(1), SIZE_MB(1), SIZE_MB(1),
+						   MREMAP_MAYMOVE | MREMAP_FIXED, dest + SIZE_MB(1));
+	if (new_ptr == MAP_FAILED) {
+		perror("mremap");
+		success = 0;
+		goto out;
 	}
-	/*
-	 * Check that the address is aligned to the specified alignment.
-	 * Addresses which have alignments that are multiples of that
-	 * specified are not considered valid. For instance, 1GB address is
-	 * 2MB-aligned, however it will not be considered valid for a
-	 * requested alignment of 2MB. This is done to reduce coincidental
-	 * alignment in the tests.
-	 */
-	if (((unsigned long long) src_addr & (c.src_alignment - 1)) ||
-			!((unsigned long long) src_addr & c.src_alignment)) {
-		munmap(src_addr, c.region_size);
-		goto retry;
+
+	/* Verify byte pattern after remapping */
+	srand(pattern_seed);
+	for (i = 0; i < SIZE_MB(1); i++) {
+		char c = (char) rand();
+
+		if (((char *)src)[i] != c) {
+			ksft_print_msg("Data at src at %d got corrupted due to unrelated mremap\n",
+				       i);
+			ksft_print_msg("Expected: %#x\t Got: %#x\n", c & 0xff,
+					((char *) src)[i] & 0xff);
+			success = 0;
+		}
 	}
 
-	if (!src_addr)
-		goto error;
+out:
+	if (munmap(ptr, size) == -1)
+		perror("munmap");
 
-	return src_addr;
-error:
-	ksft_print_msg("Failed to map source region: %s\n",
-			strerror(errno));
-	return NULL;
+	if (success)
+		ksft_test_result_pass("%s\n", test_name);
+	else
+		ksft_test_result_fail("%s\n", test_name);
 }
 
 /* Returns the time taken for the remap on success else returns -1. */
 static long long remap_region(struct config c, unsigned int threshold_mb,
 			      char pattern_seed)
 {
-	void *addr, *src_addr, *dest_addr;
+	void *addr, *src_addr, *dest_addr, *dest_preamble_addr;
 	unsigned long long i;
 	struct timespec t_start = {0, 0}, t_end = {0, 0};
 	long long  start_ns, end_ns, align_mask, ret, offset;
@@ -294,7 +376,7 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
 		goto out;
 	}
 
-	/* Set byte pattern */
+	/* Set byte pattern for source block. */
 	srand(pattern_seed);
 	for (i = 0; i < threshold; i++)
 		memset((char *) src_addr + i, (char) rand(), 1);
@@ -306,6 +388,9 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
 	addr = (void *) (((unsigned long long) src_addr + c.region_size
 			  + offset) & align_mask);
 
+	/* Remap after the destination block preamble. */
+	addr += c.dest_preamble_size;
+
 	/* See comment in get_source_mapping() */
 	if (!((unsigned long long) addr & c.dest_alignment))
 		addr = (void *) ((unsigned long long) addr | c.dest_alignment);
@@ -316,11 +401,29 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
 		if (addr + c.dest_alignment < addr) {
 			ksft_print_msg("Couldn't find a valid region to remap to\n");
 			ret = -1;
-			goto out;
+			goto clean_up_src;
 		}
 		addr += c.dest_alignment;
 	}
 
+	if (c.dest_preamble_size) {
+		dest_preamble_addr = mmap((void *) addr - c.dest_preamble_size, c.dest_preamble_size,
+					  PROT_READ | PROT_WRITE,
+					  MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED,
+							-1, 0);
+		if (dest_preamble_addr == MAP_FAILED) {
+			ksft_print_msg("Failed to map dest preamble region: %s\n",
+					strerror(errno));
+			ret = -1;
+			goto clean_up_src;
+		}
+
+		/* Set byte pattern for the dest preamble block. */
+		srand(pattern_seed);
+		for (i = 0; i < c.dest_preamble_size; i++)
+			memset((char *) dest_preamble_addr + i, (char) rand(), 1);
+	}
+
 	clock_gettime(CLOCK_MONOTONIC, &t_start);
 	dest_addr = mremap(src_addr, c.region_size, c.region_size,
 					  MREMAP_MAYMOVE|MREMAP_FIXED, (char *) addr);
@@ -329,7 +432,7 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
 	if (dest_addr == MAP_FAILED) {
 		ksft_print_msg("mremap failed: %s\n", strerror(errno));
 		ret = -1;
-		goto clean_up_src;
+		goto clean_up_dest_preamble;
 	}
 
 	/* Verify byte pattern after remapping */
@@ -338,7 +441,7 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
 		char c = (char) rand();
 
 		if (((char *) dest_addr)[i] != c) {
-			ksft_print_msg("Data after remap doesn't match at offset %d\n",
+			ksft_print_msg("Data after remap doesn't match at offset %llu\n",
 				       i);
 			ksft_print_msg("Expected: %#x\t Got: %#x\n", c & 0xff,
 					((char *) dest_addr)[i] & 0xff);
@@ -347,6 +450,23 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
 		}
 	}
 
+	/* Verify the dest preamble byte pattern after remapping */
+	if (c.dest_preamble_size) {
+		srand(pattern_seed);
+		for (i = 0; i < c.dest_preamble_size; i++) {
+			char c = (char) rand();
+
+			if (((char *) dest_preamble_addr)[i] != c) {
+				ksft_print_msg("Preamble data after remap doesn't match at offset %d\n",
+					       i);
+				ksft_print_msg("Expected: %#x\t Got: %#x\n", c & 0xff,
+					       ((char *) dest_preamble_addr)[i] & 0xff);
+				ret = -1;
+				goto clean_up_dest;
+			}
+		}
+	}
+
 	start_ns = t_start.tv_sec * NS_PER_SEC + t_start.tv_nsec;
 	end_ns = t_end.tv_sec * NS_PER_SEC + t_end.tv_nsec;
 	ret = end_ns - start_ns;
@@ -359,12 +479,92 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
  */
 clean_up_dest:
 	munmap(dest_addr, c.region_size);
+clean_up_dest_preamble:
+	if (c.dest_preamble_size && dest_preamble_addr)
+		munmap(dest_preamble_addr, c.dest_preamble_size);
 clean_up_src:
 	munmap(src_addr, c.region_size);
 out:
 	return ret;
 }
 
+/*
+ * Verify that an mremap aligning down does not destroy
+ * the beginning of the mapping just because the aligned
+ * down address landed on a mapping that maybe does not exist.
+ */
+static void mremap_move_1mb_from_start(char pattern_seed)
+{
+	char *test_name = "mremap move 1mb from start at 1MB+256KB aligned src";
+	void *src = NULL, *dest = NULL;
+	int i, success = 1;
+
+	/* Config to reuse get_source_mapping() to do an aligned mmap. */
+	struct config c = {
+		.src_alignment = SIZE_MB(1) + SIZE_KB(256),
+		.region_size = SIZE_MB(6)
+	};
+
+	src = get_source_mapping(c);
+	if (!src) {
+		success = 0;
+		goto out;
+	}
+
+	c.src_alignment = SIZE_MB(1) + SIZE_KB(256);
+	dest = get_source_mapping(c);
+	if (!dest) {
+		success = 0;
+		goto out;
+	}
+
+	/* Set byte pattern for source block. */
+	srand(pattern_seed);
+	for (i = 0; i < SIZE_MB(2); i++) {
+		((char *)src)[i] = (char) rand();
+	}
+
+	/*
+	 * Unmap the beginning of dest so that the aligned address
+	 * falls on no mapping.
+	 */
+	munmap(dest, SIZE_MB(1));
+
+	void *new_ptr = mremap(src + SIZE_MB(1), SIZE_MB(1), SIZE_MB(1),
+						   MREMAP_MAYMOVE | MREMAP_FIXED, dest + SIZE_MB(1));
+	if (new_ptr == MAP_FAILED) {
+		perror("mremap");
+		success = 0;
+		goto out;
+	}
+
+	/* Verify byte pattern after remapping */
+	srand(pattern_seed);
+	for (i = 0; i < SIZE_MB(1); i++) {
+		char c = (char) rand();
+
+		if (((char *)src)[i] != c) {
+			ksft_print_msg("Data at src at %d got corrupted due to unrelated mremap\n",
+				       i);
+			ksft_print_msg("Expected: %#x\t Got: %#x\n", c & 0xff,
+					((char *) src)[i] & 0xff);
+			success = 0;
+		}
+	}
+
+out:
+	if (src && munmap(src, c.region_size) == -1)
+		perror("munmap src");
+
+	if (dest && munmap(dest, c.region_size) == -1)
+		perror("munmap dest");
+
+	if (success)
+		ksft_test_result_pass("%s\n", test_name);
+	else
+		ksft_test_result_fail("%s\n", test_name);
+}
+
 static void run_mremap_test_case(struct test test_case, int *failures,
 				 unsigned int threshold_mb,
 				 unsigned int pattern_seed)
@@ -434,7 +634,7 @@ static int parse_args(int argc, char **argv, unsigned int *threshold_mb,
 	return 0;
 }
 
-#define MAX_TEST 13
+#define MAX_TEST 15
 #define MAX_PERF_TEST 3
 int main(int argc, char **argv)
 {
@@ -443,7 +643,8 @@ int main(int argc, char **argv)
 	unsigned int threshold_mb = VALIDATION_DEFAULT_THRESHOLD;
 	unsigned int pattern_seed;
 	int num_expand_tests = 2;
-	struct test test_cases[MAX_TEST];
+	int num_misc_tests = 2;
+	struct test test_cases[MAX_TEST] = {};
 	struct test perf_test_cases[MAX_PERF_TEST];
 	int page_size;
 	time_t t;
@@ -500,6 +701,15 @@ int main(int argc, char **argv)
 	test_cases[12] = MAKE_TEST(PUD, PUD, _2GB, NON_OVERLAPPING, EXPECT_SUCCESS,
 				   "2GB mremap - Source PUD-aligned, Destination PUD-aligned");
 
+	/* Src and Dest addr 1MB aligned. 5MB mremap. */
+	test_cases[13] = MAKE_TEST(_1MB, _1MB, _5MB, NON_OVERLAPPING, EXPECT_SUCCESS,
+				  "5MB mremap - Source 1MB-aligned, Destination 1MB-aligned");
+
+	/* Src and Dest addr 1MB aligned. 5MB mremap. */
+	test_cases[14] = MAKE_TEST(_1MB, _1MB, _5MB, NON_OVERLAPPING, EXPECT_SUCCESS,
+				  "5MB mremap - Source 1MB-aligned, Dest 1MB-aligned with 40MB Preamble");
+	test_cases[14].config.dest_preamble_size = 10 * _4MB;
+
 	perf_test_cases[0] =  MAKE_TEST(page_size, page_size, _1GB, NON_OVERLAPPING, EXPECT_SUCCESS,
 					"1GB mremap - Source PTE-aligned, Destination PTE-aligned");
 	/*
@@ -515,7 +725,7 @@ int main(int argc, char **argv)
 				(threshold_mb * _1MB >= _1GB);
 
 	ksft_set_plan(ARRAY_SIZE(test_cases) + (run_perf_tests ?
-		      ARRAY_SIZE(perf_test_cases) : 0) + num_expand_tests);
+		      ARRAY_SIZE(perf_test_cases) : 0) + num_expand_tests + num_misc_tests);
 
 	for (i = 0; i < ARRAY_SIZE(test_cases); i++)
 		run_mremap_test_case(test_cases[i], &failures, threshold_mb,
@@ -533,6 +743,9 @@ int main(int argc, char **argv)
 
 	fclose(maps_fp);
 
+	mremap_move_within_range(pattern_seed);
+	mremap_move_1mb_from_start(pattern_seed);
+
 	if (run_perf_tests) {
 		ksft_print_msg("\n%s\n",
 		 "mremap HAVE_MOVE_PMD/PUD optimization time comparison for 1GB region:");
diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c
new file mode 100644
index 0000000000..d59517ed3d
--- /dev/null
+++ b/tools/testing/selftests/mm/pagemap_ioctl.c
@@ -0,0 +1,1664 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <malloc.h>
+#include "vm_util.h"
+#include "../kselftest.h"
+#include <linux/types.h>
+#include <linux/memfd.h>
+#include <linux/userfaultfd.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <math.h>
+#include <asm/unistd.h>
+#include <pthread.h>
+#include <sys/resource.h>
+#include <assert.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+
+#define PAGEMAP_BITS_ALL		(PAGE_IS_WPALLOWED | PAGE_IS_WRITTEN |	\
+					 PAGE_IS_FILE | PAGE_IS_PRESENT |	\
+					 PAGE_IS_SWAPPED | PAGE_IS_PFNZERO |	\
+					 PAGE_IS_HUGE)
+#define PAGEMAP_NON_WRITTEN_BITS	(PAGE_IS_WPALLOWED | PAGE_IS_FILE |	\
+					 PAGE_IS_PRESENT | PAGE_IS_SWAPPED |	\
+					 PAGE_IS_PFNZERO | PAGE_IS_HUGE)
+
+#define TEST_ITERATIONS 100
+#define PAGEMAP "/proc/self/pagemap"
+int pagemap_fd;
+int uffd;
+int page_size;
+int hpage_size;
+const char *progname;
+
+#define LEN(region)	((region.end - region.start)/page_size)
+
+static long pagemap_ioctl(void *start, int len, void *vec, int vec_len, int flag,
+			  int max_pages, long required_mask, long anyof_mask, long excluded_mask,
+			  long return_mask)
+{
+	struct pm_scan_arg arg;
+
+	arg.start = (uintptr_t)start;
+	arg.end = (uintptr_t)(start + len);
+	arg.vec = (uintptr_t)vec;
+	arg.vec_len = vec_len;
+	arg.flags = flag;
+	arg.size = sizeof(struct pm_scan_arg);
+	arg.max_pages = max_pages;
+	arg.category_mask = required_mask;
+	arg.category_anyof_mask = anyof_mask;
+	arg.category_inverted = excluded_mask;
+	arg.return_mask = return_mask;
+
+	return ioctl(pagemap_fd, PAGEMAP_SCAN, &arg);
+}
+
+static long pagemap_ioc(void *start, int len, void *vec, int vec_len, int flag,
+			int max_pages, long required_mask, long anyof_mask, long excluded_mask,
+			long return_mask, long *walk_end)
+{
+	struct pm_scan_arg arg;
+	int ret;
+
+	arg.start = (uintptr_t)start;
+	arg.end = (uintptr_t)(start + len);
+	arg.vec = (uintptr_t)vec;
+	arg.vec_len = vec_len;
+	arg.flags = flag;
+	arg.size = sizeof(struct pm_scan_arg);
+	arg.max_pages = max_pages;
+	arg.category_mask = required_mask;
+	arg.category_anyof_mask = anyof_mask;
+	arg.category_inverted = excluded_mask;
+	arg.return_mask = return_mask;
+
+	ret = ioctl(pagemap_fd, PAGEMAP_SCAN, &arg);
+
+	if (walk_end)
+		*walk_end = arg.walk_end;
+
+	return ret;
+}
+
+
+int init_uffd(void)
+{
+	struct uffdio_api uffdio_api;
+
+	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY);
+	if (uffd == -1)
+		return uffd;
+
+	uffdio_api.api = UFFD_API;
+	uffdio_api.features = UFFD_FEATURE_WP_UNPOPULATED | UFFD_FEATURE_WP_ASYNC |
+			      UFFD_FEATURE_WP_HUGETLBFS_SHMEM;
+	if (ioctl(uffd, UFFDIO_API, &uffdio_api))
+		return -1;
+
+	if (!(uffdio_api.api & UFFDIO_REGISTER_MODE_WP) ||
+	    !(uffdio_api.features & UFFD_FEATURE_WP_UNPOPULATED) ||
+	    !(uffdio_api.features & UFFD_FEATURE_WP_ASYNC) ||
+	    !(uffdio_api.features & UFFD_FEATURE_WP_HUGETLBFS_SHMEM))
+		return -1;
+
+	return 0;
+}
+
+int wp_init(void *lpBaseAddress, int dwRegionSize)
+{
+	struct uffdio_register uffdio_register;
+	struct uffdio_writeprotect wp;
+
+	uffdio_register.range.start = (unsigned long)lpBaseAddress;
+	uffdio_register.range.len = dwRegionSize;
+	uffdio_register.mode = UFFDIO_REGISTER_MODE_WP;
+	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))
+		ksft_exit_fail_msg("ioctl(UFFDIO_REGISTER) %d %s\n", errno, strerror(errno));
+
+	if (!(uffdio_register.ioctls & UFFDIO_WRITEPROTECT))
+		ksft_exit_fail_msg("ioctl set is incorrect\n");
+
+	wp.range.start = (unsigned long)lpBaseAddress;
+	wp.range.len = dwRegionSize;
+	wp.mode = UFFDIO_WRITEPROTECT_MODE_WP;
+
+	if (ioctl(uffd, UFFDIO_WRITEPROTECT, &wp))
+		ksft_exit_fail_msg("ioctl(UFFDIO_WRITEPROTECT)\n");
+
+	return 0;
+}
+
+int wp_free(void *lpBaseAddress, int dwRegionSize)
+{
+	struct uffdio_register uffdio_register;
+
+	uffdio_register.range.start = (unsigned long)lpBaseAddress;
+	uffdio_register.range.len = dwRegionSize;
+	uffdio_register.mode = UFFDIO_REGISTER_MODE_WP;
+	if (ioctl(uffd, UFFDIO_UNREGISTER, &uffdio_register.range))
+		ksft_exit_fail_msg("ioctl unregister failure\n");
+	return 0;
+}
+
+int wp_addr_range(void *lpBaseAddress, int dwRegionSize)
+{
+	if (pagemap_ioctl(lpBaseAddress, dwRegionSize, NULL, 0,
+			  PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", 1, errno, strerror(errno));
+
+	return 0;
+}
+
+void *gethugetlb_mem(int size, int *shmid)
+{
+	char *mem;
+
+	if (shmid) {
+		*shmid = shmget(2, size, SHM_HUGETLB | IPC_CREAT | SHM_R | SHM_W);
+		if (*shmid < 0)
+			return NULL;
+
+		mem = shmat(*shmid, 0, 0);
+		if (mem == (char *)-1) {
+			shmctl(*shmid, IPC_RMID, NULL);
+			ksft_exit_fail_msg("Shared memory attach failure\n");
+		}
+	} else {
+		mem = mmap(NULL, size, PROT_READ | PROT_WRITE,
+			   MAP_ANONYMOUS | MAP_HUGETLB | MAP_PRIVATE, -1, 0);
+		if (mem == MAP_FAILED)
+			return NULL;
+	}
+
+	return mem;
+}
+
+int userfaultfd_tests(void)
+{
+	int mem_size, vec_size, written, num_pages = 16;
+	char *mem, *vec;
+
+	mem_size = num_pages * page_size;
+	mem = mmap(NULL, mem_size, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+
+	wp_init(mem, mem_size);
+
+	/* Change protection of pages differently */
+	mprotect(mem, mem_size/8, PROT_READ|PROT_WRITE);
+	mprotect(mem + 1 * mem_size/8, mem_size/8, PROT_READ);
+	mprotect(mem + 2 * mem_size/8, mem_size/8, PROT_READ|PROT_WRITE);
+	mprotect(mem + 3 * mem_size/8, mem_size/8, PROT_READ);
+	mprotect(mem + 4 * mem_size/8, mem_size/8, PROT_READ|PROT_WRITE);
+	mprotect(mem + 5 * mem_size/8, mem_size/8, PROT_NONE);
+	mprotect(mem + 6 * mem_size/8, mem_size/8, PROT_READ|PROT_WRITE);
+	mprotect(mem + 7 * mem_size/8, mem_size/8, PROT_READ);
+
+	wp_addr_range(mem + (mem_size/16), mem_size - 2 * (mem_size/8));
+	wp_addr_range(mem, mem_size);
+
+	vec_size = mem_size/page_size;
+	vec = malloc(sizeof(struct page_region) * vec_size);
+
+	written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				vec_size - 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	ksft_test_result(written == 0, "%s all new pages must not be written (dirty)\n", __func__);
+
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+	free(vec);
+	return 0;
+}
+
+int get_reads(struct page_region *vec, int vec_size)
+{
+	int i, sum = 0;
+
+	for (i = 0; i < vec_size; i++)
+		sum += LEN(vec[i]);
+
+	return sum;
+}
+
+int sanity_tests_sd(void)
+{
+	int mem_size, vec_size, ret, ret2, ret3, i, num_pages = 1000, total_pages = 0;
+	int total_writes, total_reads, reads, count;
+	struct page_region *vec, *vec2;
+	char *mem, *m[2];
+	long walk_end;
+
+	vec_size = num_pages/2;
+	mem_size = num_pages * page_size;
+
+	vec = malloc(sizeof(struct page_region) * vec_size);
+	if (!vec)
+		ksft_exit_fail_msg("error nomem\n");
+
+	vec2 = malloc(sizeof(struct page_region) * vec_size);
+	if (!vec2)
+		ksft_exit_fail_msg("error nomem\n");
+
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	/* 1. wrong operation */
+	ksft_test_result(pagemap_ioctl(mem, 0, vec, vec_size, 0,
+				       0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) == 0,
+			 "%s Zero range size is valid\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, NULL, vec_size, 0,
+				       0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) < 0,
+			 "%s output buffer must be specified with size\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, 0, 0,
+				       0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) == 0,
+			 "%s output buffer can be 0\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, 0, 0, 0,
+				       0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) == 0,
+			 "%s output buffer can be 0\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, -1,
+				       0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0,
+			 "%s wrong flag specified\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size,
+				       PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC | 0xFF,
+				       0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) < 0,
+			 "%s flag has extra bits specified\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0,
+				       0, 0, 0, 0, PAGE_IS_WRITTEN) >= 0,
+			 "%s no selection mask is specified\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0,
+				       0, PAGE_IS_WRITTEN, PAGE_IS_WRITTEN, 0, 0) == 0,
+			 "%s no return mask is specified\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0,
+				       0, PAGE_IS_WRITTEN, 0, 0, 0x1000) < 0,
+			 "%s wrong return mask specified\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size,
+				       PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				       0, 0xFFF, PAGE_IS_WRITTEN, 0, PAGE_IS_WRITTEN) < 0,
+			 "%s mixture of correct and wrong flag\n", __func__);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size,
+				       PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				       0, 0, 0, PAGEMAP_BITS_ALL, PAGE_IS_WRITTEN) >= 0,
+			 "%s PAGEMAP_BITS_ALL can be specified with PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC\n",
+			 __func__);
+
+	/* 2. Clear area with larger vec size */
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, 0,
+			    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	ksft_test_result(ret >= 0, "%s Clear area with larger vec size\n", __func__);
+
+	/* 3. Repeated pattern of written and non-written pages */
+	for (i = 0; i < mem_size; i += 2 * page_size)
+		mem[i]++;
+
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, PAGE_IS_WRITTEN, 0,
+			    0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	ksft_test_result(ret == mem_size/(page_size * 2),
+			 "%s Repeated pattern of written and non-written pages\n", __func__);
+
+	/* 4. Repeated pattern of written and non-written pages in parts */
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			    num_pages/2 - 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	ret2 = pagemap_ioctl(mem, mem_size, vec, 2, 0, 0, PAGE_IS_WRITTEN, 0, 0,
+			     PAGE_IS_WRITTEN);
+	if (ret2 < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret2, errno, strerror(errno));
+
+	ret3 = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			     PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			     0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret3 < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret3, errno, strerror(errno));
+
+	ksft_test_result((ret + ret3) == num_pages/2 && ret2 == 2,
+			 "%s Repeated pattern of written and non-written pages in parts %d %d %d\n",
+			 __func__, ret, ret3, ret2);
+
+	/* 5. Repeated pattern of written and non-written pages max_pages */
+	for (i = 0; i < mem_size; i += 2 * page_size)
+		mem[i]++;
+	mem[(mem_size/page_size - 1) * page_size]++;
+
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			    num_pages/2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	ret2 = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			     PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			     0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret2 < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret2, errno, strerror(errno));
+
+	ksft_test_result(ret == num_pages/2 && ret2 == 1,
+			 "%s Repeated pattern of written and non-written pages max_pages\n",
+			 __func__);
+
+	/* 6. only get 2 dirty pages and clear them as well */
+	vec_size = mem_size/page_size;
+	memset(mem, -1, mem_size);
+
+	/* get and clear second and third pages */
+	ret = pagemap_ioctl(mem + page_size, 2 * page_size, vec, 1,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			    2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	ret2 = pagemap_ioctl(mem, mem_size, vec2, vec_size, 0, 0,
+			      PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret2 < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret2, errno, strerror(errno));
+
+	ksft_test_result(ret == 1 && LEN(vec[0]) == 2 &&
+			 vec[0].start == (uintptr_t)(mem + page_size) &&
+			 ret2 == 2 && LEN(vec2[0]) == 1 && vec2[0].start == (uintptr_t)mem &&
+			 LEN(vec2[1]) == vec_size - 3 &&
+			 vec2[1].start == (uintptr_t)(mem + 3 * page_size),
+			 "%s only get 2 written pages and clear them as well\n", __func__);
+
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+
+	/* 7. Two regions */
+	m[0] = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (m[0] == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+	m[1] = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (m[1] == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+
+	wp_init(m[0], mem_size);
+	wp_init(m[1], mem_size);
+	wp_addr_range(m[0], mem_size);
+	wp_addr_range(m[1], mem_size);
+
+	memset(m[0], 'a', mem_size);
+	memset(m[1], 'b', mem_size);
+
+	wp_addr_range(m[0], mem_size);
+
+	ret = pagemap_ioctl(m[1], mem_size, vec, 1, 0, 0, PAGE_IS_WRITTEN, 0, 0,
+			    PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	ksft_test_result(ret == 1 && LEN(vec[0]) == mem_size/page_size,
+			 "%s Two regions\n", __func__);
+
+	wp_free(m[0], mem_size);
+	wp_free(m[1], mem_size);
+	munmap(m[0], mem_size);
+	munmap(m[1], mem_size);
+
+	free(vec);
+	free(vec2);
+
+	/* 8. Smaller vec */
+	mem_size = 1050 * page_size;
+	vec_size = mem_size/(page_size*2);
+
+	vec = malloc(sizeof(struct page_region) * vec_size);
+	if (!vec)
+		ksft_exit_fail_msg("error nomem\n");
+
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, 0,
+			    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	for (i = 0; i < mem_size/page_size; i += 2)
+		mem[i * page_size]++;
+
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			    mem_size/(page_size*5), PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	total_pages += ret;
+
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			    mem_size/(page_size*5), PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	total_pages += ret;
+
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			    mem_size/(page_size*5), PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	total_pages += ret;
+
+	ksft_test_result(total_pages == mem_size/(page_size*2), "%s Smaller max_pages\n", __func__);
+
+	free(vec);
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+	total_pages = 0;
+
+	/* 9. Smaller vec */
+	mem_size = 10000 * page_size;
+	vec_size = 50;
+
+	vec = malloc(sizeof(struct page_region) * vec_size);
+	if (!vec)
+		ksft_exit_fail_msg("error nomem\n");
+
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	for (count = 0; count < TEST_ITERATIONS; count++) {
+		total_writes = total_reads = 0;
+		walk_end = (long)mem;
+
+		for (i = 0; i < mem_size; i += page_size) {
+			if (rand() % 2) {
+				mem[i]++;
+				total_writes++;
+			}
+		}
+
+		while (total_reads < total_writes) {
+			ret = pagemap_ioc((void *)walk_end, mem_size-(walk_end - (long)mem), vec,
+					  vec_size, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+					  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+			if (ret < 0)
+				ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+			if (ret > vec_size)
+				break;
+
+			reads = get_reads(vec, ret);
+			total_reads += reads;
+		}
+
+		if (total_reads != total_writes)
+			break;
+	}
+
+	ksft_test_result(count == TEST_ITERATIONS, "Smaller vec\n");
+
+	free(vec);
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+
+	/* 10. Walk_end tester */
+	vec_size = 1000;
+	mem_size = vec_size * page_size;
+
+	vec = malloc(sizeof(struct page_region) * vec_size);
+	if (!vec)
+		ksft_exit_fail_msg("error nomem\n");
+
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	memset(mem, 0, mem_size);
+
+	ret = pagemap_ioc(mem, 0, vec, vec_size, 0,
+			  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 0 && walk_end == (long)mem,
+			 "Walk_end: Same start and end address\n");
+
+	ret = pagemap_ioc(mem, 0, vec, vec_size, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 0 && walk_end == (long)mem,
+			 "Walk_end: Same start and end with WP\n");
+
+	ret = pagemap_ioc(mem, 0, vec, 0, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+			  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 0 && walk_end == (long)mem,
+			 "Walk_end: Same start and end with 0 output buffer\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0,
+			  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size),
+			 "Walk_end: Big vec\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, 1, 0,
+			  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size),
+			 "Walk_end: vec of minimum length\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, 1, 0,
+			  vec_size, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size),
+			 "Walk_end: Max pages specified\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0,
+			  vec_size/2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size/2),
+			 "Walk_end: Half max pages\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0,
+			  1, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + page_size),
+			 "Walk_end: 1 max page\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0,
+			  -1, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + mem_size),
+			 "Walk_end: max pages\n");
+
+	wp_addr_range(mem, mem_size);
+	for (i = 0; i < mem_size; i += 2 * page_size)
+		mem[i]++;
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0,
+			  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == vec_size/2 && walk_end == (long)(mem + mem_size),
+			 "Walk_end sparse: Big vec\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, 1, 0,
+			  0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + page_size * 2),
+			 "Walk_end sparse: vec of minimum length\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, 1, 0,
+			  vec_size, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + page_size * 2),
+			 "Walk_end sparse: Max pages specified\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size/2, 0,
+			  vec_size, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == vec_size/2 && walk_end == (long)(mem + mem_size),
+			 "Walk_end sparse: Max pages specified\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0,
+			  vec_size, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == vec_size/2 && walk_end == (long)(mem + mem_size),
+			 "Walk_end sparse: Max pages specified\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0,
+			  vec_size/2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == vec_size/2 && walk_end == (long)(mem + mem_size),
+			 "Walk_endsparse : Half max pages\n");
+
+	ret = pagemap_ioc(mem, mem_size, vec, vec_size, 0,
+			  1, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN, &walk_end);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+	ksft_test_result(ret == 1 && walk_end == (long)(mem + page_size * 2),
+			 "Walk_end: 1 max page\n");
+
+	free(vec);
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+
+	return 0;
+}
+
+int base_tests(char *prefix, char *mem, int mem_size, int skip)
+{
+	int vec_size, written;
+	struct page_region *vec, *vec2;
+
+	if (skip) {
+		ksft_test_result_skip("%s all new pages must not be written (dirty)\n", prefix);
+		ksft_test_result_skip("%s all pages must be written (dirty)\n", prefix);
+		ksft_test_result_skip("%s all pages dirty other than first and the last one\n",
+				      prefix);
+		ksft_test_result_skip("%s PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC\n", prefix);
+		ksft_test_result_skip("%s only middle page dirty\n", prefix);
+		ksft_test_result_skip("%s only two middle pages dirty\n", prefix);
+		return 0;
+	}
+
+	vec_size = mem_size/page_size;
+	vec = malloc(sizeof(struct page_region) * vec_size);
+	vec2 = malloc(sizeof(struct page_region) * vec_size);
+
+	/* 1. all new pages must be not be written (dirty) */
+	written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				vec_size - 2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	ksft_test_result(written == 0, "%s all new pages must not be written (dirty)\n", prefix);
+
+	/* 2. all pages must be written */
+	memset(mem, -1, mem_size);
+
+	written = pagemap_ioctl(mem, mem_size, vec, 1, 0, 0, PAGE_IS_WRITTEN, 0, 0,
+			      PAGE_IS_WRITTEN);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	ksft_test_result(written == 1 && LEN(vec[0]) == mem_size/page_size,
+			 "%s all pages must be written (dirty)\n", prefix);
+
+	/* 3. all pages dirty other than first and the last one */
+	written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	memset(mem + page_size, 0, mem_size - (2 * page_size));
+
+	written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	ksft_test_result(written == 1 && LEN(vec[0]) >= vec_size - 2 && LEN(vec[0]) <= vec_size,
+			 "%s all pages dirty other than first and the last one\n", prefix);
+
+	written = pagemap_ioctl(mem, mem_size, vec, 1, 0, 0,
+				PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	ksft_test_result(written == 0,
+			 "%s PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC\n", prefix);
+
+	/* 4. only middle page dirty */
+	written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	mem[vec_size/2 * page_size]++;
+
+	written = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0, PAGE_IS_WRITTEN,
+				0, 0, PAGE_IS_WRITTEN);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	ksft_test_result(written == 1 && LEN(vec[0]) >= 1,
+			 "%s only middle page dirty\n", prefix);
+
+	/* 5. only two middle pages dirty and walk over only middle pages */
+	written = pagemap_ioctl(mem, mem_size, vec, 1, PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN | PAGE_IS_HUGE);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	mem[vec_size/2 * page_size]++;
+	mem[(vec_size/2 + 1) * page_size]++;
+
+	written = pagemap_ioctl(&mem[vec_size/2 * page_size], 2 * page_size, vec, 1, 0,
+				0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN | PAGE_IS_HUGE);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	ksft_test_result(written == 1 && vec[0].start == (uintptr_t)(&mem[vec_size/2 * page_size])
+			 && LEN(vec[0]) == 2,
+			 "%s only two middle pages dirty\n", prefix);
+
+	free(vec);
+	free(vec2);
+	return 0;
+}
+
+void *gethugepage(int map_size)
+{
+	int ret;
+	char *map;
+
+	map = memalign(hpage_size, map_size);
+	if (!map)
+		ksft_exit_fail_msg("memalign failed %d %s\n", errno, strerror(errno));
+
+	ret = madvise(map, map_size, MADV_HUGEPAGE);
+	if (ret)
+		return NULL;
+
+	memset(map, 0, map_size);
+
+	return map;
+}
+
+int hpage_unit_tests(void)
+{
+	char *map;
+	int ret, ret2;
+	size_t num_pages = 10;
+	int map_size = hpage_size * num_pages;
+	int vec_size = map_size/page_size;
+	struct page_region *vec, *vec2;
+
+	vec = malloc(sizeof(struct page_region) * vec_size);
+	vec2 = malloc(sizeof(struct page_region) * vec_size);
+	if (!vec || !vec2)
+		ksft_exit_fail_msg("malloc failed\n");
+
+	map = gethugepage(map_size);
+	if (map) {
+		wp_init(map, map_size);
+		wp_addr_range(map, map_size);
+
+		/* 1. all new huge page must not be written (dirty) */
+		ret = pagemap_ioctl(map, map_size, vec, vec_size,
+				    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, 0,
+				    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ksft_test_result(ret == 0, "%s all new huge page must not be written (dirty)\n",
+				 __func__);
+
+		/* 2. all the huge page must not be written */
+		ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0,
+				    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ksft_test_result(ret == 0, "%s all the huge page must not be written\n", __func__);
+
+		/* 3. all the huge page must be written and clear dirty as well */
+		memset(map, -1, map_size);
+		ret = pagemap_ioctl(map, map_size, vec, vec_size,
+				    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				    0, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ksft_test_result(ret == 1 && vec[0].start == (uintptr_t)map &&
+				 LEN(vec[0]) == vec_size && vec[0].categories == PAGE_IS_WRITTEN,
+				 "%s all the huge page must be written and clear\n", __func__);
+
+		/* 4. only middle page written */
+		wp_free(map, map_size);
+		free(map);
+		map = gethugepage(map_size);
+		wp_init(map, map_size);
+		wp_addr_range(map, map_size);
+		map[vec_size/2 * page_size]++;
+
+		ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0,
+				    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ksft_test_result(ret == 1 && LEN(vec[0]) > 0,
+				 "%s only middle page written\n", __func__);
+
+		wp_free(map, map_size);
+		free(map);
+	} else {
+		ksft_test_result_skip("%s all new huge page must be written\n", __func__);
+		ksft_test_result_skip("%s all the huge page must not be written\n", __func__);
+		ksft_test_result_skip("%s all the huge page must be written and clear\n", __func__);
+		ksft_test_result_skip("%s only middle page written\n", __func__);
+	}
+
+	/* 5. clear first half of huge page */
+	map = gethugepage(map_size);
+	if (map) {
+		wp_init(map, map_size);
+		wp_addr_range(map, map_size);
+
+		memset(map, 0, map_size);
+
+		wp_addr_range(map, map_size/2);
+
+		ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0,
+				    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ksft_test_result(ret == 1 && LEN(vec[0]) == vec_size/2 &&
+				 vec[0].start == (uintptr_t)(map + map_size/2),
+				 "%s clear first half of huge page\n", __func__);
+		wp_free(map, map_size);
+		free(map);
+	} else {
+		ksft_test_result_skip("%s clear first half of huge page\n", __func__);
+	}
+
+	/* 6. clear first half of huge page with limited buffer */
+	map = gethugepage(map_size);
+	if (map) {
+		wp_init(map, map_size);
+		wp_addr_range(map, map_size);
+
+		memset(map, 0, map_size);
+
+		ret = pagemap_ioctl(map, map_size, vec, vec_size,
+				    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				    vec_size/2, PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0,
+				    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ksft_test_result(ret == 1 && LEN(vec[0]) == vec_size/2 &&
+				 vec[0].start == (uintptr_t)(map + map_size/2),
+				 "%s clear first half of huge page with limited buffer\n",
+				 __func__);
+		wp_free(map, map_size);
+		free(map);
+	} else {
+		ksft_test_result_skip("%s clear first half of huge page with limited buffer\n",
+				      __func__);
+	}
+
+	/* 7. clear second half of huge page */
+	map = gethugepage(map_size);
+	if (map) {
+		wp_init(map, map_size);
+		wp_addr_range(map, map_size);
+
+		memset(map, -1, map_size);
+
+		ret = pagemap_ioctl(map + map_size/2, map_size/2, vec, vec_size,
+				    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, vec_size/2,
+				    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ret = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0,
+				    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ksft_test_result(ret == 1 && LEN(vec[0]) == vec_size/2,
+				 "%s clear second half huge page\n", __func__);
+		wp_free(map, map_size);
+		free(map);
+	} else {
+		ksft_test_result_skip("%s clear second half huge page\n", __func__);
+	}
+
+	/* 8. get half huge page */
+	map = gethugepage(map_size);
+	if (map) {
+		wp_init(map, map_size);
+		wp_addr_range(map, map_size);
+
+		memset(map, -1, map_size);
+		usleep(100);
+
+		ret = pagemap_ioctl(map, map_size, vec, 1,
+				    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				    hpage_size/(2*page_size), PAGE_IS_WRITTEN, 0, 0,
+				    PAGE_IS_WRITTEN);
+		if (ret < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+		ksft_test_result(ret == 1 && LEN(vec[0]) == hpage_size/(2*page_size),
+				 "%s get half huge page\n", __func__);
+
+		ret2 = pagemap_ioctl(map, map_size, vec, vec_size, 0, 0,
+				    PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN);
+		if (ret2 < 0)
+			ksft_exit_fail_msg("error %d %d %s\n", ret2, errno, strerror(errno));
+
+		ksft_test_result(ret2 == 1 && LEN(vec[0]) == (map_size - hpage_size/2)/page_size,
+				 "%s get half huge page\n", __func__);
+
+		wp_free(map, map_size);
+		free(map);
+	} else {
+		ksft_test_result_skip("%s get half huge page\n", __func__);
+		ksft_test_result_skip("%s get half huge page\n", __func__);
+	}
+
+	free(vec);
+	free(vec2);
+	return 0;
+}
+
+int unmapped_region_tests(void)
+{
+	void *start = (void *)0x10000000;
+	int written, len = 0x00040000;
+	int vec_size = len / page_size;
+	struct page_region *vec = malloc(sizeof(struct page_region) * vec_size);
+
+	/* 1. Get written pages */
+	written = pagemap_ioctl(start, len, vec, vec_size, 0, 0,
+				PAGEMAP_NON_WRITTEN_BITS, 0, 0, PAGEMAP_NON_WRITTEN_BITS);
+	if (written < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", written, errno, strerror(errno));
+
+	ksft_test_result(written >= 0, "%s Get status of pages\n", __func__);
+
+	free(vec);
+	return 0;
+}
+
+static void test_simple(void)
+{
+	int i;
+	char *map;
+	struct page_region vec;
+
+	map = aligned_alloc(page_size, page_size);
+	if (!map)
+		ksft_exit_fail_msg("aligned_alloc failed\n");
+
+	wp_init(map, page_size);
+	wp_addr_range(map, page_size);
+
+	for (i = 0 ; i < TEST_ITERATIONS; i++) {
+		if (pagemap_ioctl(map, page_size, &vec, 1, 0, 0,
+				  PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) == 1) {
+			ksft_print_msg("written bit was 1, but should be 0 (i=%d)\n", i);
+			break;
+		}
+
+		wp_addr_range(map, page_size);
+		/* Write something to the page to get the written bit enabled on the page */
+		map[0]++;
+
+		if (pagemap_ioctl(map, page_size, &vec, 1, 0, 0,
+				  PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) == 0) {
+			ksft_print_msg("written bit was 0, but should be 1 (i=%d)\n", i);
+			break;
+		}
+
+		wp_addr_range(map, page_size);
+	}
+	wp_free(map, page_size);
+	free(map);
+
+	ksft_test_result(i == TEST_ITERATIONS, "Test %s\n", __func__);
+}
+
+int sanity_tests(void)
+{
+	int mem_size, vec_size, ret, fd, i, buf_size;
+	struct page_region *vec;
+	char *mem, *fmem;
+	struct stat sbuf;
+	char *tmp_buf;
+
+	/* 1. wrong operation */
+	mem_size = 10 * page_size;
+	vec_size = mem_size / page_size;
+
+	vec = malloc(sizeof(struct page_region) * vec_size);
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED || vec == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size,
+				       PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
+				       0, PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) >= 0,
+			 "%s WP op can be specified with !PAGE_IS_WRITTEN\n", __func__);
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+				       PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL) >= 0,
+			 "%s required_mask specified\n", __func__);
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+				       0, PAGEMAP_BITS_ALL, 0, PAGEMAP_BITS_ALL) >= 0,
+			 "%s anyof_mask specified\n", __func__);
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+				       0, 0, PAGEMAP_BITS_ALL, PAGEMAP_BITS_ALL) >= 0,
+			 "%s excluded_mask specified\n", __func__);
+	ksft_test_result(pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+				       PAGEMAP_BITS_ALL, PAGEMAP_BITS_ALL, 0,
+				       PAGEMAP_BITS_ALL) >= 0,
+			 "%s required_mask and anyof_mask specified\n", __func__);
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+
+	/* 2. Get sd and present pages with anyof_mask */
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	memset(mem, 0, mem_size);
+
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+			    0, PAGEMAP_BITS_ALL, 0, PAGEMAP_BITS_ALL);
+	ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && LEN(vec[0]) == vec_size &&
+			 (vec[0].categories & (PAGE_IS_WRITTEN | PAGE_IS_PRESENT)) ==
+			 (PAGE_IS_WRITTEN | PAGE_IS_PRESENT),
+			 "%s Get sd and present pages with anyof_mask\n", __func__);
+
+	/* 3. Get sd and present pages with required_mask */
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+			    PAGEMAP_BITS_ALL, 0, 0, PAGEMAP_BITS_ALL);
+	ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && LEN(vec[0]) == vec_size &&
+			 (vec[0].categories & (PAGE_IS_WRITTEN | PAGE_IS_PRESENT)) ==
+			 (PAGE_IS_WRITTEN | PAGE_IS_PRESENT),
+			 "%s Get all the pages with required_mask\n", __func__);
+
+	/* 4. Get sd and present pages with required_mask and anyof_mask */
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+			    PAGE_IS_WRITTEN, PAGE_IS_PRESENT, 0, PAGEMAP_BITS_ALL);
+	ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && LEN(vec[0]) == vec_size &&
+			 (vec[0].categories & (PAGE_IS_WRITTEN | PAGE_IS_PRESENT)) ==
+			 (PAGE_IS_WRITTEN | PAGE_IS_PRESENT),
+			 "%s Get sd and present pages with required_mask and anyof_mask\n",
+			 __func__);
+
+	/* 5. Don't get sd pages */
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+			    PAGE_IS_WRITTEN, 0, PAGE_IS_WRITTEN, PAGEMAP_BITS_ALL);
+	ksft_test_result(ret == 0, "%s Don't get sd pages\n", __func__);
+
+	/* 6. Don't get present pages */
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size, 0, 0,
+			    PAGE_IS_PRESENT, 0, PAGE_IS_PRESENT, PAGEMAP_BITS_ALL);
+	ksft_test_result(ret == 0, "%s Don't get present pages\n", __func__);
+
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+
+	/* 8. Find written present pages with return mask */
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	memset(mem, 0, mem_size);
+
+	ret = pagemap_ioctl(mem, mem_size, vec, vec_size,
+			    PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC, 0,
+			    0, PAGEMAP_BITS_ALL, 0, PAGE_IS_WRITTEN);
+	ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)mem && LEN(vec[0]) == vec_size &&
+			 vec[0].categories == PAGE_IS_WRITTEN,
+			 "%s Find written present pages with return mask\n", __func__);
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+
+	/* 9. Memory mapped file */
+	fd = open(progname, O_RDONLY);
+	if (fd < 0)
+		ksft_exit_fail_msg("%s Memory mapped file\n", __func__);
+
+	ret = stat(progname, &sbuf);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	fmem = mmap(NULL, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (fmem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem %d %s\n", errno, strerror(errno));
+
+	tmp_buf = malloc(sbuf.st_size);
+	memcpy(tmp_buf, fmem, sbuf.st_size);
+
+	ret = pagemap_ioctl(fmem, sbuf.st_size, vec, vec_size, 0, 0,
+			    0, PAGEMAP_NON_WRITTEN_BITS, 0, PAGEMAP_NON_WRITTEN_BITS);
+
+	ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)fmem &&
+			 LEN(vec[0]) == ceilf((float)sbuf.st_size/page_size) &&
+			 (vec[0].categories & PAGE_IS_FILE),
+			 "%s Memory mapped file\n", __func__);
+
+	munmap(fmem, sbuf.st_size);
+	close(fd);
+
+	/* 10. Create and read/write to a memory mapped file */
+	buf_size = page_size * 10;
+
+	fd = open(__FILE__".tmp2", O_RDWR | O_CREAT, 0666);
+	if (fd < 0)
+		ksft_exit_fail_msg("Read/write to memory: %s\n",
+				   strerror(errno));
+
+	for (i = 0; i < buf_size; i++)
+		if (write(fd, "c", 1) < 0)
+			ksft_exit_fail_msg("Create and read/write to a memory mapped file\n");
+
+	fmem = mmap(NULL, buf_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if (fmem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem %d %s\n", errno, strerror(errno));
+
+	wp_init(fmem, buf_size);
+	wp_addr_range(fmem, buf_size);
+
+	for (i = 0; i < buf_size; i++)
+		fmem[i] = 'z';
+
+	msync(fmem, buf_size, MS_SYNC);
+
+	ret = pagemap_ioctl(fmem, buf_size, vec, vec_size, 0, 0,
+			    PAGE_IS_WRITTEN, PAGE_IS_PRESENT | PAGE_IS_SWAPPED | PAGE_IS_FILE, 0,
+			    PAGEMAP_BITS_ALL);
+
+	ksft_test_result(ret >= 0 && vec[0].start == (uintptr_t)fmem &&
+			 LEN(vec[0]) == (buf_size/page_size) &&
+			 (vec[0].categories & PAGE_IS_WRITTEN),
+			 "%s Read/write to memory\n", __func__);
+
+	wp_free(fmem, buf_size);
+	munmap(fmem, buf_size);
+	close(fd);
+
+	free(vec);
+	return 0;
+}
+
+int mprotect_tests(void)
+{
+	int ret;
+	char *mem, *mem2;
+	struct page_region vec;
+	int pagemap_fd = open("/proc/self/pagemap", O_RDONLY);
+
+	if (pagemap_fd < 0) {
+		fprintf(stderr, "open() failed\n");
+		exit(1);
+	}
+
+	/* 1. Map two pages */
+	mem = mmap(0, 2 * page_size, PROT_READ|PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+	wp_init(mem, 2 * page_size);
+	wp_addr_range(mem, 2 * page_size);
+
+	/* Populate both pages. */
+	memset(mem, 1, 2 * page_size);
+
+	ret = pagemap_ioctl(mem, 2 * page_size, &vec, 1, 0, 0, PAGE_IS_WRITTEN,
+			    0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	ksft_test_result(ret == 1 && LEN(vec) == 2, "%s Both pages written\n", __func__);
+
+	/* 2. Start tracking */
+	wp_addr_range(mem, 2 * page_size);
+
+	ksft_test_result(pagemap_ioctl(mem, 2 * page_size, &vec, 1, 0, 0,
+				       PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN) == 0,
+			 "%s Both pages are not written (dirty)\n", __func__);
+
+	/* 3. Remap the second page */
+	mem2 = mmap(mem + page_size, page_size, PROT_READ|PROT_WRITE,
+		    MAP_PRIVATE|MAP_ANON|MAP_FIXED, -1, 0);
+	if (mem2 == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+	wp_init(mem2, page_size);
+	wp_addr_range(mem2, page_size);
+
+	/* Protect + unprotect. */
+	mprotect(mem, page_size, PROT_NONE);
+	mprotect(mem, 2 * page_size, PROT_READ);
+	mprotect(mem, 2 * page_size, PROT_READ|PROT_WRITE);
+
+	/* Modify both pages. */
+	memset(mem, 2, 2 * page_size);
+
+	/* Protect + unprotect. */
+	mprotect(mem, page_size, PROT_NONE);
+	mprotect(mem, page_size, PROT_READ);
+	mprotect(mem, page_size, PROT_READ|PROT_WRITE);
+
+	ret = pagemap_ioctl(mem, 2 * page_size, &vec, 1, 0, 0, PAGE_IS_WRITTEN,
+			    0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	ksft_test_result(ret == 1 && LEN(vec) == 2,
+			 "%s Both pages written after remap and mprotect\n", __func__);
+
+	/* 4. Clear and make the pages written */
+	wp_addr_range(mem, 2 * page_size);
+
+	memset(mem, 'A', 2 * page_size);
+
+	ret = pagemap_ioctl(mem, 2 * page_size, &vec, 1, 0, 0, PAGE_IS_WRITTEN,
+			    0, 0, PAGE_IS_WRITTEN);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	ksft_test_result(ret == 1 && LEN(vec) == 2,
+			 "%s Clear and make the pages written\n", __func__);
+
+	wp_free(mem, 2 * page_size);
+	munmap(mem, 2 * page_size);
+	return 0;
+}
+
+/* transact test */
+static const unsigned int nthreads = 6, pages_per_thread = 32, access_per_thread = 8;
+static pthread_barrier_t start_barrier, end_barrier;
+static unsigned int extra_thread_faults;
+static unsigned int iter_count = 1000;
+static volatile int finish;
+
+static ssize_t get_dirty_pages_reset(char *mem, unsigned int count,
+				     int reset, int page_size)
+{
+	struct pm_scan_arg arg = {0};
+	struct page_region rgns[256];
+	int i, j, cnt, ret;
+
+	arg.size = sizeof(struct pm_scan_arg);
+	arg.start = (uintptr_t)mem;
+	arg.max_pages = count;
+	arg.end = (uintptr_t)(mem + count * page_size);
+	arg.vec = (uintptr_t)rgns;
+	arg.vec_len = sizeof(rgns) / sizeof(*rgns);
+	if (reset)
+		arg.flags |= PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC;
+	arg.category_mask = PAGE_IS_WRITTEN;
+	arg.return_mask = PAGE_IS_WRITTEN;
+
+	ret = ioctl(pagemap_fd, PAGEMAP_SCAN, &arg);
+	if (ret < 0)
+		ksft_exit_fail_msg("ioctl failed\n");
+
+	cnt = 0;
+	for (i = 0; i < ret; ++i) {
+		if (rgns[i].categories != PAGE_IS_WRITTEN)
+			ksft_exit_fail_msg("wrong flags\n");
+
+		for (j = 0; j < LEN(rgns[i]); ++j)
+			cnt++;
+	}
+
+	return cnt;
+}
+
+void *thread_proc(void *mem)
+{
+	int *m = mem;
+	long curr_faults, faults;
+	struct rusage r;
+	unsigned int i;
+	int ret;
+
+	if (getrusage(RUSAGE_THREAD, &r))
+		ksft_exit_fail_msg("getrusage\n");
+
+	curr_faults = r.ru_minflt;
+
+	while (!finish) {
+		ret = pthread_barrier_wait(&start_barrier);
+		if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD)
+			ksft_exit_fail_msg("pthread_barrier_wait\n");
+
+		for (i = 0; i < access_per_thread; ++i)
+			__atomic_add_fetch(m + i * (0x1000 / sizeof(*m)), 1, __ATOMIC_SEQ_CST);
+
+		ret = pthread_barrier_wait(&end_barrier);
+		if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD)
+			ksft_exit_fail_msg("pthread_barrier_wait\n");
+
+		if (getrusage(RUSAGE_THREAD, &r))
+			ksft_exit_fail_msg("getrusage\n");
+
+		faults = r.ru_minflt - curr_faults;
+		if (faults < access_per_thread)
+			ksft_exit_fail_msg("faults < access_per_thread");
+
+		__atomic_add_fetch(&extra_thread_faults, faults - access_per_thread,
+				   __ATOMIC_SEQ_CST);
+		curr_faults = r.ru_minflt;
+	}
+
+	return NULL;
+}
+
+static void transact_test(int page_size)
+{
+	unsigned int i, count, extra_pages;
+	pthread_t th;
+	char *mem;
+	int ret, c;
+
+	if (pthread_barrier_init(&start_barrier, NULL, nthreads + 1))
+		ksft_exit_fail_msg("pthread_barrier_init\n");
+
+	if (pthread_barrier_init(&end_barrier, NULL, nthreads + 1))
+		ksft_exit_fail_msg("pthread_barrier_init\n");
+
+	mem = mmap(NULL, 0x1000 * nthreads * pages_per_thread, PROT_READ | PROT_WRITE,
+		   MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("Error mmap %s.\n", strerror(errno));
+
+	wp_init(mem, 0x1000 * nthreads * pages_per_thread);
+	wp_addr_range(mem, 0x1000 * nthreads * pages_per_thread);
+
+	memset(mem, 0, 0x1000 * nthreads * pages_per_thread);
+
+	count = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size);
+	ksft_test_result(count > 0, "%s count %d\n", __func__, count);
+	count = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size);
+	ksft_test_result(count == 0, "%s count %d\n", __func__, count);
+
+	finish = 0;
+	for (i = 0; i < nthreads; ++i)
+		pthread_create(&th, NULL, thread_proc, mem + 0x1000 * i * pages_per_thread);
+
+	extra_pages = 0;
+	for (i = 0; i < iter_count; ++i) {
+		count = 0;
+
+		ret = pthread_barrier_wait(&start_barrier);
+		if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD)
+			ksft_exit_fail_msg("pthread_barrier_wait\n");
+
+		count = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1,
+					      page_size);
+
+		ret = pthread_barrier_wait(&end_barrier);
+		if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD)
+			ksft_exit_fail_msg("pthread_barrier_wait\n");
+
+		if (count > nthreads * access_per_thread)
+			ksft_exit_fail_msg("Too big count %d expected %d, iter %d\n",
+					   count, nthreads * access_per_thread, i);
+
+		c = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size);
+		count += c;
+
+		if (c > nthreads * access_per_thread) {
+			ksft_test_result_fail(" %s count > nthreads\n", __func__);
+			return;
+		}
+
+		if (count != nthreads * access_per_thread) {
+			/*
+			 * The purpose of the test is to make sure that no page updates are lost
+			 * when the page updates and read-resetting soft dirty flags are performed
+			 * in parallel. However, it is possible that the application will get the
+			 * soft dirty flags twice on the two consecutive read-resets. This seems
+			 * unavoidable as soft dirty flag is handled in software through page faults
+			 * in kernel. While the updating the flags is supposed to be synchronized
+			 * between page fault handling and read-reset, it is possible that
+			 * read-reset happens after page fault PTE update but before the application
+			 * re-executes write instruction. So read-reset gets the flag, clears write
+			 * access and application gets page fault again for the same write.
+			 */
+			if (count < nthreads * access_per_thread) {
+				ksft_test_result_fail("Lost update, iter %d, %d vs %d.\n", i, count,
+						      nthreads * access_per_thread);
+				return;
+			}
+
+			extra_pages += count - nthreads * access_per_thread;
+		}
+	}
+
+	pthread_barrier_wait(&start_barrier);
+	finish = 1;
+	pthread_barrier_wait(&end_barrier);
+
+	ksft_test_result_pass("%s Extra pages %u (%.1lf%%), extra thread faults %d.\n", __func__,
+			      extra_pages,
+			      100.0 * extra_pages / (iter_count * nthreads * access_per_thread),
+			      extra_thread_faults);
+}
+
+int main(int argc, char *argv[])
+{
+	int mem_size, shmid, buf_size, fd, i, ret;
+	char *mem, *map, *fmem;
+	struct stat sbuf;
+
+	progname = argv[0];
+
+	ksft_print_header();
+
+	if (init_uffd())
+		return ksft_exit_pass();
+
+	ksft_set_plan(115);
+
+	page_size = getpagesize();
+	hpage_size = read_pmd_pagesize();
+
+	pagemap_fd = open(PAGEMAP, O_RDONLY);
+	if (pagemap_fd < 0)
+		return -EINVAL;
+
+	/* 1. Sanity testing */
+	sanity_tests_sd();
+
+	/* 2. Normal page testing */
+	mem_size = 10 * page_size;
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	base_tests("Page testing:", mem, mem_size, 0);
+
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+
+	/* 3. Large page testing */
+	mem_size = 512 * 10 * page_size;
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+	if (mem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem\n");
+	wp_init(mem, mem_size);
+	wp_addr_range(mem, mem_size);
+
+	base_tests("Large Page testing:", mem, mem_size, 0);
+
+	wp_free(mem, mem_size);
+	munmap(mem, mem_size);
+
+	/* 4. Huge page testing */
+	map = gethugepage(hpage_size);
+	if (map) {
+		wp_init(map, hpage_size);
+		wp_addr_range(map, hpage_size);
+		base_tests("Huge page testing:", map, hpage_size, 0);
+		wp_free(map, hpage_size);
+		free(map);
+	} else {
+		base_tests("Huge page testing:", NULL, 0, 1);
+	}
+
+	/* 5. SHM Hugetlb page testing */
+	mem_size = 2*1024*1024;
+	mem = gethugetlb_mem(mem_size, &shmid);
+	if (mem) {
+		wp_init(mem, mem_size);
+		wp_addr_range(mem, mem_size);
+
+		base_tests("Hugetlb shmem testing:", mem, mem_size, 0);
+
+		wp_free(mem, mem_size);
+		shmctl(shmid, IPC_RMID, NULL);
+	} else {
+		base_tests("Hugetlb shmem testing:", NULL, 0, 1);
+	}
+
+	/* 6. Hugetlb page testing */
+	mem = gethugetlb_mem(mem_size, NULL);
+	if (mem) {
+		wp_init(mem, mem_size);
+		wp_addr_range(mem, mem_size);
+
+		base_tests("Hugetlb mem testing:", mem, mem_size, 0);
+
+		wp_free(mem, mem_size);
+	} else {
+		base_tests("Hugetlb mem testing:", NULL, 0, 1);
+	}
+
+	/* 7. File Hugetlb testing */
+	mem_size = 2*1024*1024;
+	fd = memfd_create("uffd-test", MFD_HUGETLB | MFD_NOEXEC_SEAL);
+	mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	if (mem) {
+		wp_init(mem, mem_size);
+		wp_addr_range(mem, mem_size);
+
+		base_tests("Hugetlb shmem testing:", mem, mem_size, 0);
+
+		wp_free(mem, mem_size);
+		shmctl(shmid, IPC_RMID, NULL);
+	} else {
+		base_tests("Hugetlb shmem testing:", NULL, 0, 1);
+	}
+	close(fd);
+
+	/* 8. File memory testing */
+	buf_size = page_size * 10;
+
+	fd = open(__FILE__".tmp0", O_RDWR | O_CREAT, 0777);
+	if (fd < 0)
+		ksft_exit_fail_msg("Create and read/write to a memory mapped file: %s\n",
+				   strerror(errno));
+
+	for (i = 0; i < buf_size; i++)
+		if (write(fd, "c", 1) < 0)
+			ksft_exit_fail_msg("Create and read/write to a memory mapped file\n");
+
+	ret = stat(__FILE__".tmp0", &sbuf);
+	if (ret < 0)
+		ksft_exit_fail_msg("error %d %d %s\n", ret, errno, strerror(errno));
+
+	fmem = mmap(NULL, sbuf.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if (fmem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem %d %s\n", errno, strerror(errno));
+
+	wp_init(fmem, sbuf.st_size);
+	wp_addr_range(fmem, sbuf.st_size);
+
+	base_tests("File memory testing:", fmem, sbuf.st_size, 0);
+
+	wp_free(fmem, sbuf.st_size);
+	munmap(fmem, sbuf.st_size);
+	close(fd);
+
+	/* 9. File memory testing */
+	buf_size = page_size * 10;
+
+	fd = memfd_create(__FILE__".tmp00", MFD_NOEXEC_SEAL);
+	if (fd < 0)
+		ksft_exit_fail_msg("Create and read/write to a memory mapped file: %s\n",
+				   strerror(errno));
+
+	if (ftruncate(fd, buf_size))
+		ksft_exit_fail_msg("Error ftruncate\n");
+
+	for (i = 0; i < buf_size; i++)
+		if (write(fd, "c", 1) < 0)
+			ksft_exit_fail_msg("Create and read/write to a memory mapped file\n");
+
+	fmem = mmap(NULL, buf_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if (fmem == MAP_FAILED)
+		ksft_exit_fail_msg("error nomem %d %s\n", errno, strerror(errno));
+
+	wp_init(fmem, buf_size);
+	wp_addr_range(fmem, buf_size);
+
+	base_tests("File anonymous memory testing:", fmem, buf_size, 0);
+
+	wp_free(fmem, buf_size);
+	munmap(fmem, buf_size);
+	close(fd);
+
+	/* 10. Huge page tests */
+	hpage_unit_tests();
+
+	/* 11. Iterative test */
+	test_simple();
+
+	/* 12. Mprotect test */
+	mprotect_tests();
+
+	/* 13. Transact test */
+	transact_test(page_size);
+
+	/* 14. Sanity testing */
+	sanity_tests();
+
+	/*15. Unmapped address test */
+	unmapped_region_tests();
+
+	/* 16. Userfaultfd tests */
+	userfaultfd_tests();
+
+	close(pagemap_fd);
+	return ksft_exit_pass();
+}
diff --git a/tools/testing/selftests/mm/pkey-helpers.h b/tools/testing/selftests/mm/pkey-helpers.h
index 92f3be3dd8..1af3156a9d 100644
--- a/tools/testing/selftests/mm/pkey-helpers.h
+++ b/tools/testing/selftests/mm/pkey-helpers.h
@@ -34,7 +34,7 @@ extern int test_nr;
 extern int iteration_nr;
 
 #ifdef __GNUC__
-__attribute__((format(printf, 1, 2)))
+__printf(1, 2)
 #endif
 static inline void sigsafe_printf(const char *format, ...)
 {
diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index 3e2bc818d5..0075744527 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -56,6 +56,8 @@ separated by spaces:
 	memory protection key tests
 - soft_dirty
 	test soft dirty page bit semantics
+- pagemap
+	test pagemap_scan IOCTL
 - cow
 	test copy-on-write semantics
 - thp
@@ -221,6 +223,13 @@ CATEGORY="hugetlb" run_test ./hugepage-mremap
 CATEGORY="hugetlb" run_test ./hugepage-vmemmap
 CATEGORY="hugetlb" run_test ./hugetlb-madvise
 
+nr_hugepages_tmp=$(cat /proc/sys/vm/nr_hugepages)
+# For this test, we need one and just one huge page
+echo 1 > /proc/sys/vm/nr_hugepages
+CATEGORY="hugetlb" run_test ./hugetlb_fault_after_madv
+# Restore the previous number of huge pages, since further tests rely on it
+echo "$nr_hugepages_tmp" > /proc/sys/vm/nr_hugepages
+
 if test_selected "hugetlb"; then
 	echo "NOTE: These hugetlb tests provide minimal coverage.  Use"
 	echo "      https://github.com/libhugetlbfs/libhugetlbfs.git for"
@@ -303,6 +312,7 @@ CATEGORY="hmm" run_test bash ./test_hmm.sh smoke
 # MADV_POPULATE_READ and MADV_POPULATE_WRITE tests
 CATEGORY="madv_populate" run_test ./madv_populate
 
+echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope
 CATEGORY="memfd_secret" run_test ./memfd_secret
 
 # KSM KSM_MERGE_TIME_HUGE_PAGES test with size of 100
@@ -342,6 +352,8 @@ then
 	CATEGORY="soft_dirty" run_test ./soft-dirty
 fi
 
+CATEGORY="pagemap" run_test ./pagemap_ioctl
+
 # COW tests
 CATEGORY="cow" run_test ./cow
 
diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c
index 2709a34a39..2c68709062 100644
--- a/tools/testing/selftests/mm/uffd-unit-tests.c
+++ b/tools/testing/selftests/mm/uffd-unit-tests.c
@@ -1309,6 +1309,12 @@ int main(int argc, char *argv[])
 				continue;
 
 			uffd_test_start("%s on %s", test->name, mem_type->name);
+			if ((mem_type->mem_flag == MEM_HUGETLB ||
+			    mem_type->mem_flag == MEM_HUGETLB_PRIVATE) &&
+			    (default_huge_page_size() == 0)) {
+				uffd_test_skip("huge page size is 0, feature missing?");
+				continue;
+			}
 			if (!uffd_feature_supported(test)) {
 				uffd_test_skip("feature missing");
 				continue;
diff --git a/tools/testing/selftests/mm/va_high_addr_switch.sh b/tools/testing/selftests/mm/va_high_addr_switch.sh
index 45cae7cab2..a0a75f3029 100755
--- a/tools/testing/selftests/mm/va_high_addr_switch.sh
+++ b/tools/testing/selftests/mm/va_high_addr_switch.sh
@@ -29,9 +29,15 @@ check_supported_x86_64()
 	# See man 1 gzip under '-f'.
 	local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)
 
+	local cpu_supports_pl5=$(awk '/^flags/ {if (/la57/) {print 0;}
+		else {print 1}; exit}' /proc/cpuinfo 2>/dev/null)
+
 	if [[ "${pg_table_levels}" -lt 5 ]]; then
 		echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
 		exit $ksft_skip
+	elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then
+		echo "$0: CPU does not have the necessary la57 flag to support page table level 5"
+		exit $ksft_skip
 	fi
 }
 
diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c
index 558c9cd890..3082b40492 100644
--- a/tools/testing/selftests/mm/vm_util.c
+++ b/tools/testing/selftests/mm/vm_util.c
@@ -269,3 +269,22 @@ int uffd_unregister(int uffd, void *addr, uint64_t len)
 
 	return ret;
 }
+
+unsigned long get_free_hugepages(void)
+{
+	unsigned long fhp = 0;
+	char *line = NULL;
+	size_t linelen = 0;
+	FILE *f = fopen("/proc/meminfo", "r");
+
+	if (!f)
+		return fhp;
+	while (getline(&line, &linelen, f) > 0) {
+		if (sscanf(line, "HugePages_Free:      %lu", &fhp) == 1)
+			break;
+	}
+
+	free(line);
+	fclose(f);
+	return fhp;
+}
diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h
index c7fa61f0df..c02990bbd5 100644
--- a/tools/testing/selftests/mm/vm_util.h
+++ b/tools/testing/selftests/mm/vm_util.h
@@ -51,6 +51,7 @@ int uffd_register(int uffd, void *addr, uint64_t len,
 int uffd_unregister(int uffd, void *addr, uint64_t len);
 int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
 			      bool miss, bool wp, bool minor, uint64_t *ioctls);
+unsigned long get_free_hugepages(void);
 
 /*
  * On ppc64 this will only work with radix 2M hugepage size
diff --git a/tools/testing/selftests/mm/write_hugetlb_memory.sh b/tools/testing/selftests/mm/write_hugetlb_memory.sh
index 70a02301f4..3d2d2eb9d6 100755
--- a/tools/testing/selftests/mm/write_hugetlb_memory.sh
+++ b/tools/testing/selftests/mm/write_hugetlb_memory.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
 set -e