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-rw-r--r--lib/test_xarray.c1836
1 files changed, 1836 insertions, 0 deletions
diff --git a/lib/test_xarray.c b/lib/test_xarray.c
new file mode 100644
index 0000000000..e77d485644
--- /dev/null
+++ b/lib/test_xarray.c
@@ -0,0 +1,1836 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * test_xarray.c: Test the XArray API
+ * Copyright (c) 2017-2018 Microsoft Corporation
+ * Copyright (c) 2019-2020 Oracle
+ * Author: Matthew Wilcox <willy@infradead.org>
+ */
+
+#include <linux/xarray.h>
+#include <linux/module.h>
+
+static unsigned int tests_run;
+static unsigned int tests_passed;
+
+static const unsigned int order_limit =
+ IS_ENABLED(CONFIG_XARRAY_MULTI) ? BITS_PER_LONG : 1;
+
+#ifndef XA_DEBUG
+# ifdef __KERNEL__
+void xa_dump(const struct xarray *xa) { }
+# endif
+#undef XA_BUG_ON
+#define XA_BUG_ON(xa, x) do { \
+ tests_run++; \
+ if (x) { \
+ printk("BUG at %s:%d\n", __func__, __LINE__); \
+ xa_dump(xa); \
+ dump_stack(); \
+ } else { \
+ tests_passed++; \
+ } \
+} while (0)
+#endif
+
+static void *xa_mk_index(unsigned long index)
+{
+ return xa_mk_value(index & LONG_MAX);
+}
+
+static void *xa_store_index(struct xarray *xa, unsigned long index, gfp_t gfp)
+{
+ return xa_store(xa, index, xa_mk_index(index), gfp);
+}
+
+static void xa_insert_index(struct xarray *xa, unsigned long index)
+{
+ XA_BUG_ON(xa, xa_insert(xa, index, xa_mk_index(index),
+ GFP_KERNEL) != 0);
+}
+
+static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
+{
+ u32 id;
+
+ XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(index), xa_limit_32b,
+ gfp) != 0);
+ XA_BUG_ON(xa, id != index);
+}
+
+static void xa_erase_index(struct xarray *xa, unsigned long index)
+{
+ XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index));
+ XA_BUG_ON(xa, xa_load(xa, index) != NULL);
+}
+
+/*
+ * If anyone needs this, please move it to xarray.c. We have no current
+ * users outside the test suite because all current multislot users want
+ * to use the advanced API.
+ */
+static void *xa_store_order(struct xarray *xa, unsigned long index,
+ unsigned order, void *entry, gfp_t gfp)
+{
+ XA_STATE_ORDER(xas, xa, index, order);
+ void *curr;
+
+ do {
+ xas_lock(&xas);
+ curr = xas_store(&xas, entry);
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, gfp));
+
+ return curr;
+}
+
+static noinline void check_xa_err(struct xarray *xa)
+{
+ XA_BUG_ON(xa, xa_err(xa_store_index(xa, 0, GFP_NOWAIT)) != 0);
+ XA_BUG_ON(xa, xa_err(xa_erase(xa, 0)) != 0);
+#ifndef __KERNEL__
+ /* The kernel does not fail GFP_NOWAIT allocations */
+ XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
+ XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
+#endif
+ XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_KERNEL)) != 0);
+ XA_BUG_ON(xa, xa_err(xa_store(xa, 1, xa_mk_value(0), GFP_KERNEL)) != 0);
+ XA_BUG_ON(xa, xa_err(xa_erase(xa, 1)) != 0);
+// kills the test-suite :-(
+// XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL);
+}
+
+static noinline void check_xas_retry(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 0);
+ void *entry;
+
+ xa_store_index(xa, 0, GFP_KERNEL);
+ xa_store_index(xa, 1, GFP_KERNEL);
+
+ rcu_read_lock();
+ XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0));
+ xa_erase_index(xa, 1);
+ XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas)));
+ XA_BUG_ON(xa, xas_retry(&xas, NULL));
+ XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0)));
+ xas_reset(&xas);
+ XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);
+ XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
+ XA_BUG_ON(xa, xas.xa_node != NULL);
+ rcu_read_unlock();
+
+ XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
+
+ rcu_read_lock();
+ XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));
+ xas.xa_node = XAS_RESTART;
+ XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
+ rcu_read_unlock();
+
+ /* Make sure we can iterate through retry entries */
+ xas_lock(&xas);
+ xas_set(&xas, 0);
+ xas_store(&xas, XA_RETRY_ENTRY);
+ xas_set(&xas, 1);
+ xas_store(&xas, XA_RETRY_ENTRY);
+
+ xas_set(&xas, 0);
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ xas_store(&xas, xa_mk_index(xas.xa_index));
+ }
+ xas_unlock(&xas);
+
+ xa_erase_index(xa, 0);
+ xa_erase_index(xa, 1);
+}
+
+static noinline void check_xa_load(struct xarray *xa)
+{
+ unsigned long i, j;
+
+ for (i = 0; i < 1024; i++) {
+ for (j = 0; j < 1024; j++) {
+ void *entry = xa_load(xa, j);
+ if (j < i)
+ XA_BUG_ON(xa, xa_to_value(entry) != j);
+ else
+ XA_BUG_ON(xa, entry);
+ }
+ XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
+ }
+
+ for (i = 0; i < 1024; i++) {
+ for (j = 0; j < 1024; j++) {
+ void *entry = xa_load(xa, j);
+ if (j >= i)
+ XA_BUG_ON(xa, xa_to_value(entry) != j);
+ else
+ XA_BUG_ON(xa, entry);
+ }
+ xa_erase_index(xa, i);
+ }
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index)
+{
+ unsigned int order;
+ unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 8 : 1;
+
+ /* NULL elements have no marks set */
+ XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
+ xa_set_mark(xa, index, XA_MARK_0);
+ XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
+
+ /* Storing a pointer will not make a mark appear */
+ XA_BUG_ON(xa, xa_store_index(xa, index, GFP_KERNEL) != NULL);
+ XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
+ xa_set_mark(xa, index, XA_MARK_0);
+ XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
+
+ /* Setting one mark will not set another mark */
+ XA_BUG_ON(xa, xa_get_mark(xa, index + 1, XA_MARK_0));
+ XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_1));
+
+ /* Storing NULL clears marks, and they can't be set again */
+ xa_erase_index(xa, index);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
+ xa_set_mark(xa, index, XA_MARK_0);
+ XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
+
+ /*
+ * Storing a multi-index entry over entries with marks gives the
+ * entire entry the union of the marks
+ */
+ BUG_ON((index % 4) != 0);
+ for (order = 2; order < max_order; order++) {
+ unsigned long base = round_down(index, 1UL << order);
+ unsigned long next = base + (1UL << order);
+ unsigned long i;
+
+ XA_BUG_ON(xa, xa_store_index(xa, index + 1, GFP_KERNEL));
+ xa_set_mark(xa, index + 1, XA_MARK_0);
+ XA_BUG_ON(xa, xa_store_index(xa, index + 2, GFP_KERNEL));
+ xa_set_mark(xa, index + 2, XA_MARK_2);
+ XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL));
+ xa_store_order(xa, index, order, xa_mk_index(index),
+ GFP_KERNEL);
+ for (i = base; i < next; i++) {
+ XA_STATE(xas, xa, i);
+ unsigned int seen = 0;
+ void *entry;
+
+ XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
+ XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_1));
+ XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_2));
+
+ /* We should see two elements in the array */
+ rcu_read_lock();
+ xas_for_each(&xas, entry, ULONG_MAX)
+ seen++;
+ rcu_read_unlock();
+ XA_BUG_ON(xa, seen != 2);
+
+ /* One of which is marked */
+ xas_set(&xas, 0);
+ seen = 0;
+ rcu_read_lock();
+ xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
+ seen++;
+ rcu_read_unlock();
+ XA_BUG_ON(xa, seen != 1);
+ }
+ XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_0));
+ XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_1));
+ XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_2));
+ xa_erase_index(xa, index);
+ xa_erase_index(xa, next);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ }
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_xa_mark_2(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 0);
+ unsigned long index;
+ unsigned int count = 0;
+ void *entry;
+
+ xa_store_index(xa, 0, GFP_KERNEL);
+ xa_set_mark(xa, 0, XA_MARK_0);
+ xas_lock(&xas);
+ xas_load(&xas);
+ xas_init_marks(&xas);
+ xas_unlock(&xas);
+ XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0);
+
+ for (index = 3500; index < 4500; index++) {
+ xa_store_index(xa, index, GFP_KERNEL);
+ xa_set_mark(xa, index, XA_MARK_0);
+ }
+
+ xas_reset(&xas);
+ rcu_read_lock();
+ xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
+ count++;
+ rcu_read_unlock();
+ XA_BUG_ON(xa, count != 1000);
+
+ xas_lock(&xas);
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ xas_init_marks(&xas);
+ XA_BUG_ON(xa, !xa_get_mark(xa, xas.xa_index, XA_MARK_0));
+ XA_BUG_ON(xa, !xas_get_mark(&xas, XA_MARK_0));
+ }
+ xas_unlock(&xas);
+
+ xa_destroy(xa);
+}
+
+static noinline void check_xa_mark_3(struct xarray *xa)
+{
+#ifdef CONFIG_XARRAY_MULTI
+ XA_STATE(xas, xa, 0x41);
+ void *entry;
+ int count = 0;
+
+ xa_store_order(xa, 0x40, 2, xa_mk_index(0x40), GFP_KERNEL);
+ xa_set_mark(xa, 0x41, XA_MARK_0);
+
+ rcu_read_lock();
+ xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0) {
+ count++;
+ XA_BUG_ON(xa, entry != xa_mk_index(0x40));
+ }
+ XA_BUG_ON(xa, count != 1);
+ rcu_read_unlock();
+ xa_destroy(xa);
+#endif
+}
+
+static noinline void check_xa_mark(struct xarray *xa)
+{
+ unsigned long index;
+
+ for (index = 0; index < 16384; index += 4)
+ check_xa_mark_1(xa, index);
+
+ check_xa_mark_2(xa);
+ check_xa_mark_3(xa);
+}
+
+static noinline void check_xa_shrink(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 1);
+ struct xa_node *node;
+ unsigned int order;
+ unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 15 : 1;
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+ XA_BUG_ON(xa, xa_store_index(xa, 0, GFP_KERNEL) != NULL);
+ XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
+
+ /*
+ * Check that erasing the entry at 1 shrinks the tree and properly
+ * marks the node as being deleted.
+ */
+ xas_lock(&xas);
+ XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1));
+ node = xas.xa_node;
+ XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != xa_mk_value(0));
+ XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
+ XA_BUG_ON(xa, xa_load(xa, 1) != NULL);
+ XA_BUG_ON(xa, xas.xa_node != XAS_BOUNDS);
+ XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != XA_RETRY_ENTRY);
+ XA_BUG_ON(xa, xas_load(&xas) != NULL);
+ xas_unlock(&xas);
+ XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
+ xa_erase_index(xa, 0);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ for (order = 0; order < max_order; order++) {
+ unsigned long max = (1UL << order) - 1;
+ xa_store_order(xa, 0, order, xa_mk_value(0), GFP_KERNEL);
+ XA_BUG_ON(xa, xa_load(xa, max) != xa_mk_value(0));
+ XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
+ rcu_read_lock();
+ node = xa_head(xa);
+ rcu_read_unlock();
+ XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) !=
+ NULL);
+ rcu_read_lock();
+ XA_BUG_ON(xa, xa_head(xa) == node);
+ rcu_read_unlock();
+ XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
+ xa_erase_index(xa, ULONG_MAX);
+ XA_BUG_ON(xa, xa->xa_head != node);
+ xa_erase_index(xa, 0);
+ }
+}
+
+static noinline void check_insert(struct xarray *xa)
+{
+ unsigned long i;
+
+ for (i = 0; i < 1024; i++) {
+ xa_insert_index(xa, i);
+ XA_BUG_ON(xa, xa_load(xa, i - 1) != NULL);
+ XA_BUG_ON(xa, xa_load(xa, i + 1) != NULL);
+ xa_erase_index(xa, i);
+ }
+
+ for (i = 10; i < BITS_PER_LONG; i++) {
+ xa_insert_index(xa, 1UL << i);
+ XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 1) != NULL);
+ XA_BUG_ON(xa, xa_load(xa, (1UL << i) + 1) != NULL);
+ xa_erase_index(xa, 1UL << i);
+
+ xa_insert_index(xa, (1UL << i) - 1);
+ XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 2) != NULL);
+ XA_BUG_ON(xa, xa_load(xa, 1UL << i) != NULL);
+ xa_erase_index(xa, (1UL << i) - 1);
+ }
+
+ xa_insert_index(xa, ~0UL);
+ XA_BUG_ON(xa, xa_load(xa, 0UL) != NULL);
+ XA_BUG_ON(xa, xa_load(xa, ~1UL) != NULL);
+ xa_erase_index(xa, ~0UL);
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_cmpxchg(struct xarray *xa)
+{
+ void *FIVE = xa_mk_value(5);
+ void *SIX = xa_mk_value(6);
+ void *LOTS = xa_mk_value(12345678);
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+ XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_KERNEL) != NULL);
+ XA_BUG_ON(xa, xa_insert(xa, 12345678, xa, GFP_KERNEL) != -EBUSY);
+ XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, SIX, FIVE, GFP_KERNEL) != LOTS);
+ XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, LOTS, FIVE, GFP_KERNEL) != LOTS);
+ XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, FIVE, LOTS, GFP_KERNEL) != FIVE);
+ XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != NULL);
+ XA_BUG_ON(xa, xa_cmpxchg(xa, 5, NULL, FIVE, GFP_KERNEL) != NULL);
+ XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) != -EBUSY);
+ XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != FIVE);
+ XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) == -EBUSY);
+ xa_erase_index(xa, 12345678);
+ xa_erase_index(xa, 5);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_reserve(struct xarray *xa)
+{
+ void *entry;
+ unsigned long index;
+ int count;
+
+ /* An array with a reserved entry is not empty */
+ XA_BUG_ON(xa, !xa_empty(xa));
+ XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, xa_empty(xa));
+ XA_BUG_ON(xa, xa_load(xa, 12345678));
+ xa_release(xa, 12345678);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* Releasing a used entry does nothing */
+ XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL);
+ xa_release(xa, 12345678);
+ xa_erase_index(xa, 12345678);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* cmpxchg sees a reserved entry as ZERO */
+ XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, XA_ZERO_ENTRY,
+ xa_mk_value(12345678), GFP_NOWAIT) != NULL);
+ xa_release(xa, 12345678);
+ xa_erase_index(xa, 12345678);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* xa_insert treats it as busy */
+ XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) !=
+ -EBUSY);
+ XA_BUG_ON(xa, xa_empty(xa));
+ XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* Can iterate through a reserved entry */
+ xa_store_index(xa, 5, GFP_KERNEL);
+ XA_BUG_ON(xa, xa_reserve(xa, 6, GFP_KERNEL) != 0);
+ xa_store_index(xa, 7, GFP_KERNEL);
+
+ count = 0;
+ xa_for_each(xa, index, entry) {
+ XA_BUG_ON(xa, index != 5 && index != 7);
+ count++;
+ }
+ XA_BUG_ON(xa, count != 2);
+
+ /* If we free a reserved entry, we should be able to allocate it */
+ if (xa->xa_flags & XA_FLAGS_ALLOC) {
+ u32 id;
+
+ XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(8),
+ XA_LIMIT(5, 10), GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != 8);
+
+ xa_release(xa, 6);
+ XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(6),
+ XA_LIMIT(5, 10), GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != 6);
+ }
+
+ xa_destroy(xa);
+}
+
+static noinline void check_xas_erase(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 0);
+ void *entry;
+ unsigned long i, j;
+
+ for (i = 0; i < 200; i++) {
+ for (j = i; j < 2 * i + 17; j++) {
+ xas_set(&xas, j);
+ do {
+ xas_lock(&xas);
+ xas_store(&xas, xa_mk_index(j));
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_KERNEL));
+ }
+
+ xas_set(&xas, ULONG_MAX);
+ do {
+ xas_lock(&xas);
+ xas_store(&xas, xa_mk_value(0));
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_KERNEL));
+
+ xas_lock(&xas);
+ xas_store(&xas, NULL);
+
+ xas_set(&xas, 0);
+ j = i;
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ XA_BUG_ON(xa, entry != xa_mk_index(j));
+ xas_store(&xas, NULL);
+ j++;
+ }
+ xas_unlock(&xas);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ }
+}
+
+#ifdef CONFIG_XARRAY_MULTI
+static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
+ unsigned int order)
+{
+ XA_STATE(xas, xa, index);
+ unsigned long min = index & ~((1UL << order) - 1);
+ unsigned long max = min + (1UL << order);
+
+ xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
+ XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index));
+ XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index));
+ XA_BUG_ON(xa, xa_load(xa, max) != NULL);
+ XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
+
+ xas_lock(&xas);
+ XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
+ xas_unlock(&xas);
+ XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min));
+ XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min));
+ XA_BUG_ON(xa, xa_load(xa, max) != NULL);
+ XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
+
+ xa_erase_index(xa, min);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
+ unsigned int order)
+{
+ XA_STATE(xas, xa, index);
+ xa_store_order(xa, index, order, xa_mk_value(0), GFP_KERNEL);
+
+ xas_lock(&xas);
+ XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0));
+ XA_BUG_ON(xa, xas.xa_index != index);
+ XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
+ xas_unlock(&xas);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
+ unsigned int order)
+{
+ XA_STATE(xas, xa, 0);
+ void *entry;
+ int n = 0;
+
+ xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
+
+ xas_lock(&xas);
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ XA_BUG_ON(xa, entry != xa_mk_index(index));
+ n++;
+ }
+ XA_BUG_ON(xa, n != 1);
+ xas_set(&xas, index + 1);
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ XA_BUG_ON(xa, entry != xa_mk_index(index));
+ n++;
+ }
+ XA_BUG_ON(xa, n != 2);
+ xas_unlock(&xas);
+
+ xa_destroy(xa);
+}
+#endif
+
+static noinline void check_multi_store(struct xarray *xa)
+{
+#ifdef CONFIG_XARRAY_MULTI
+ unsigned long i, j, k;
+ unsigned int max_order = (sizeof(long) == 4) ? 30 : 60;
+
+ /* Loading from any position returns the same value */
+ xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL);
+ XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
+ XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
+ XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
+ rcu_read_lock();
+ XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2);
+ XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
+ rcu_read_unlock();
+
+ /* Storing adjacent to the value does not alter the value */
+ xa_store(xa, 3, xa, GFP_KERNEL);
+ XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
+ XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
+ XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
+ rcu_read_lock();
+ XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3);
+ XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
+ rcu_read_unlock();
+
+ /* Overwriting multiple indexes works */
+ xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL);
+ XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1));
+ XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1));
+ XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1));
+ XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1));
+ XA_BUG_ON(xa, xa_load(xa, 4) != NULL);
+ rcu_read_lock();
+ XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4);
+ XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4);
+ rcu_read_unlock();
+
+ /* We can erase multiple values with a single store */
+ xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* Even when the first slot is empty but the others aren't */
+ xa_store_index(xa, 1, GFP_KERNEL);
+ xa_store_index(xa, 2, GFP_KERNEL);
+ xa_store_order(xa, 0, 2, NULL, GFP_KERNEL);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ for (i = 0; i < max_order; i++) {
+ for (j = 0; j < max_order; j++) {
+ xa_store_order(xa, 0, i, xa_mk_index(i), GFP_KERNEL);
+ xa_store_order(xa, 0, j, xa_mk_index(j), GFP_KERNEL);
+
+ for (k = 0; k < max_order; k++) {
+ void *entry = xa_load(xa, (1UL << k) - 1);
+ if ((i < k) && (j < k))
+ XA_BUG_ON(xa, entry != NULL);
+ else
+ XA_BUG_ON(xa, entry != xa_mk_index(j));
+ }
+
+ xa_erase(xa, 0);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ }
+ }
+
+ for (i = 0; i < 20; i++) {
+ check_multi_store_1(xa, 200, i);
+ check_multi_store_1(xa, 0, i);
+ check_multi_store_1(xa, (1UL << i) + 1, i);
+ }
+ check_multi_store_2(xa, 4095, 9);
+
+ for (i = 1; i < 20; i++) {
+ check_multi_store_3(xa, 0, i);
+ check_multi_store_3(xa, 1UL << i, i);
+ }
+#endif
+}
+
+static noinline void check_xa_alloc_1(struct xarray *xa, unsigned int base)
+{
+ int i;
+ u32 id;
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+ /* An empty array should assign %base to the first alloc */
+ xa_alloc_index(xa, base, GFP_KERNEL);
+
+ /* Erasing it should make the array empty again */
+ xa_erase_index(xa, base);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* And it should assign %base again */
+ xa_alloc_index(xa, base, GFP_KERNEL);
+
+ /* Allocating and then erasing a lot should not lose base */
+ for (i = base + 1; i < 2 * XA_CHUNK_SIZE; i++)
+ xa_alloc_index(xa, i, GFP_KERNEL);
+ for (i = base; i < 2 * XA_CHUNK_SIZE; i++)
+ xa_erase_index(xa, i);
+ xa_alloc_index(xa, base, GFP_KERNEL);
+
+ /* Destroying the array should do the same as erasing */
+ xa_destroy(xa);
+
+ /* And it should assign %base again */
+ xa_alloc_index(xa, base, GFP_KERNEL);
+
+ /* The next assigned ID should be base+1 */
+ xa_alloc_index(xa, base + 1, GFP_KERNEL);
+ xa_erase_index(xa, base + 1);
+
+ /* Storing a value should mark it used */
+ xa_store_index(xa, base + 1, GFP_KERNEL);
+ xa_alloc_index(xa, base + 2, GFP_KERNEL);
+
+ /* If we then erase base, it should be free */
+ xa_erase_index(xa, base);
+ xa_alloc_index(xa, base, GFP_KERNEL);
+
+ xa_erase_index(xa, base + 1);
+ xa_erase_index(xa, base + 2);
+
+ for (i = 1; i < 5000; i++) {
+ xa_alloc_index(xa, base + i, GFP_KERNEL);
+ }
+
+ xa_destroy(xa);
+
+ /* Check that we fail properly at the limit of allocation */
+ XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX - 1),
+ XA_LIMIT(UINT_MAX - 1, UINT_MAX),
+ GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != 0xfffffffeU);
+ XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX),
+ XA_LIMIT(UINT_MAX - 1, UINT_MAX),
+ GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != 0xffffffffU);
+ id = 3;
+ XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(0),
+ XA_LIMIT(UINT_MAX - 1, UINT_MAX),
+ GFP_KERNEL) != -EBUSY);
+ XA_BUG_ON(xa, id != 3);
+ xa_destroy(xa);
+
+ XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5),
+ GFP_KERNEL) != -EBUSY);
+ XA_BUG_ON(xa, xa_store_index(xa, 3, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5),
+ GFP_KERNEL) != -EBUSY);
+ xa_erase_index(xa, 3);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_xa_alloc_2(struct xarray *xa, unsigned int base)
+{
+ unsigned int i, id;
+ unsigned long index;
+ void *entry;
+
+ /* Allocate and free a NULL and check xa_empty() behaves */
+ XA_BUG_ON(xa, !xa_empty(xa));
+ XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != base);
+ XA_BUG_ON(xa, xa_empty(xa));
+ XA_BUG_ON(xa, xa_erase(xa, id) != NULL);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* Ditto, but check destroy instead of erase */
+ XA_BUG_ON(xa, !xa_empty(xa));
+ XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != base);
+ XA_BUG_ON(xa, xa_empty(xa));
+ xa_destroy(xa);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ for (i = base; i < base + 10; i++) {
+ XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b,
+ GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != i);
+ }
+
+ XA_BUG_ON(xa, xa_store(xa, 3, xa_mk_index(3), GFP_KERNEL) != NULL);
+ XA_BUG_ON(xa, xa_store(xa, 4, xa_mk_index(4), GFP_KERNEL) != NULL);
+ XA_BUG_ON(xa, xa_store(xa, 4, NULL, GFP_KERNEL) != xa_mk_index(4));
+ XA_BUG_ON(xa, xa_erase(xa, 5) != NULL);
+ XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != 5);
+
+ xa_for_each(xa, index, entry) {
+ xa_erase_index(xa, index);
+ }
+
+ for (i = base; i < base + 9; i++) {
+ XA_BUG_ON(xa, xa_erase(xa, i) != NULL);
+ XA_BUG_ON(xa, xa_empty(xa));
+ }
+ XA_BUG_ON(xa, xa_erase(xa, 8) != NULL);
+ XA_BUG_ON(xa, xa_empty(xa));
+ XA_BUG_ON(xa, xa_erase(xa, base + 9) != NULL);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ xa_destroy(xa);
+}
+
+static noinline void check_xa_alloc_3(struct xarray *xa, unsigned int base)
+{
+ struct xa_limit limit = XA_LIMIT(1, 0x3fff);
+ u32 next = 0;
+ unsigned int i, id;
+ unsigned long index;
+ void *entry;
+
+ XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(1), limit,
+ &next, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != 1);
+
+ next = 0x3ffd;
+ XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(0x3ffd), limit,
+ &next, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != 0x3ffd);
+ xa_erase_index(xa, 0x3ffd);
+ xa_erase_index(xa, 1);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ for (i = 0x3ffe; i < 0x4003; i++) {
+ if (i < 0x4000)
+ entry = xa_mk_index(i);
+ else
+ entry = xa_mk_index(i - 0x3fff);
+ XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, entry, limit,
+ &next, GFP_KERNEL) != (id == 1));
+ XA_BUG_ON(xa, xa_mk_index(id) != entry);
+ }
+
+ /* Check wrap-around is handled correctly */
+ if (base != 0)
+ xa_erase_index(xa, base);
+ xa_erase_index(xa, base + 1);
+ next = UINT_MAX;
+ XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(UINT_MAX),
+ xa_limit_32b, &next, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != UINT_MAX);
+ XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base),
+ xa_limit_32b, &next, GFP_KERNEL) != 1);
+ XA_BUG_ON(xa, id != base);
+ XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base + 1),
+ xa_limit_32b, &next, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != base + 1);
+
+ xa_for_each(xa, index, entry)
+ xa_erase_index(xa, index);
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static DEFINE_XARRAY_ALLOC(xa0);
+static DEFINE_XARRAY_ALLOC1(xa1);
+
+static noinline void check_xa_alloc(void)
+{
+ check_xa_alloc_1(&xa0, 0);
+ check_xa_alloc_1(&xa1, 1);
+ check_xa_alloc_2(&xa0, 0);
+ check_xa_alloc_2(&xa1, 1);
+ check_xa_alloc_3(&xa0, 0);
+ check_xa_alloc_3(&xa1, 1);
+}
+
+static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
+ unsigned int order, unsigned int present)
+{
+ XA_STATE_ORDER(xas, xa, start, order);
+ void *entry;
+ unsigned int count = 0;
+
+retry:
+ xas_lock(&xas);
+ xas_for_each_conflict(&xas, entry) {
+ XA_BUG_ON(xa, !xa_is_value(entry));
+ XA_BUG_ON(xa, entry < xa_mk_index(start));
+ XA_BUG_ON(xa, entry > xa_mk_index(start + (1UL << order) - 1));
+ count++;
+ }
+ xas_store(&xas, xa_mk_index(start));
+ xas_unlock(&xas);
+ if (xas_nomem(&xas, GFP_KERNEL)) {
+ count = 0;
+ goto retry;
+ }
+ XA_BUG_ON(xa, xas_error(&xas));
+ XA_BUG_ON(xa, count != present);
+ XA_BUG_ON(xa, xa_load(xa, start) != xa_mk_index(start));
+ XA_BUG_ON(xa, xa_load(xa, start + (1UL << order) - 1) !=
+ xa_mk_index(start));
+ xa_erase_index(xa, start);
+}
+
+static noinline void check_store_iter(struct xarray *xa)
+{
+ unsigned int i, j;
+ unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
+
+ for (i = 0; i < max_order; i++) {
+ unsigned int min = 1 << i;
+ unsigned int max = (2 << i) - 1;
+ __check_store_iter(xa, 0, i, 0);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ __check_store_iter(xa, min, i, 0);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ xa_store_index(xa, min, GFP_KERNEL);
+ __check_store_iter(xa, min, i, 1);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ xa_store_index(xa, max, GFP_KERNEL);
+ __check_store_iter(xa, min, i, 1);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ for (j = 0; j < min; j++)
+ xa_store_index(xa, j, GFP_KERNEL);
+ __check_store_iter(xa, 0, i, min);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ for (j = 0; j < min; j++)
+ xa_store_index(xa, min + j, GFP_KERNEL);
+ __check_store_iter(xa, min, i, min);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ }
+#ifdef CONFIG_XARRAY_MULTI
+ xa_store_index(xa, 63, GFP_KERNEL);
+ xa_store_index(xa, 65, GFP_KERNEL);
+ __check_store_iter(xa, 64, 2, 1);
+ xa_erase_index(xa, 63);
+#endif
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
+{
+#ifdef CONFIG_XARRAY_MULTI
+ unsigned long multi = 3 << order;
+ unsigned long next = 4 << order;
+ unsigned long index;
+
+ xa_store_order(xa, multi, order, xa_mk_value(multi), GFP_KERNEL);
+ XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL) != NULL);
+ XA_BUG_ON(xa, xa_store_index(xa, next + 1, GFP_KERNEL) != NULL);
+
+ index = 0;
+ XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
+ xa_mk_value(multi));
+ XA_BUG_ON(xa, index != multi);
+ index = multi + 1;
+ XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
+ xa_mk_value(multi));
+ XA_BUG_ON(xa, (index < multi) || (index >= next));
+ XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
+ xa_mk_value(next));
+ XA_BUG_ON(xa, index != next);
+ XA_BUG_ON(xa, xa_find_after(xa, &index, next, XA_PRESENT) != NULL);
+ XA_BUG_ON(xa, index != next);
+
+ xa_erase_index(xa, multi);
+ xa_erase_index(xa, next);
+ xa_erase_index(xa, next + 1);
+ XA_BUG_ON(xa, !xa_empty(xa));
+#endif
+}
+
+static noinline void check_multi_find_2(struct xarray *xa)
+{
+ unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
+ unsigned int i, j;
+ void *entry;
+
+ for (i = 0; i < max_order; i++) {
+ unsigned long index = 1UL << i;
+ for (j = 0; j < index; j++) {
+ XA_STATE(xas, xa, j + index);
+ xa_store_index(xa, index - 1, GFP_KERNEL);
+ xa_store_order(xa, index, i, xa_mk_index(index),
+ GFP_KERNEL);
+ rcu_read_lock();
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ xa_erase_index(xa, index);
+ }
+ rcu_read_unlock();
+ xa_erase_index(xa, index - 1);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ }
+ }
+}
+
+static noinline void check_multi_find_3(struct xarray *xa)
+{
+ unsigned int order;
+
+ for (order = 5; order < order_limit; order++) {
+ unsigned long index = 1UL << (order - 5);
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+ xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL);
+ XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT));
+ xa_erase_index(xa, 0);
+ }
+}
+
+static noinline void check_find_1(struct xarray *xa)
+{
+ unsigned long i, j, k;
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /*
+ * Check xa_find with all pairs between 0 and 99 inclusive,
+ * starting at every index between 0 and 99
+ */
+ for (i = 0; i < 100; i++) {
+ XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
+ xa_set_mark(xa, i, XA_MARK_0);
+ for (j = 0; j < i; j++) {
+ XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
+ NULL);
+ xa_set_mark(xa, j, XA_MARK_0);
+ for (k = 0; k < 100; k++) {
+ unsigned long index = k;
+ void *entry = xa_find(xa, &index, ULONG_MAX,
+ XA_PRESENT);
+ if (k <= j)
+ XA_BUG_ON(xa, index != j);
+ else if (k <= i)
+ XA_BUG_ON(xa, index != i);
+ else
+ XA_BUG_ON(xa, entry != NULL);
+
+ index = k;
+ entry = xa_find(xa, &index, ULONG_MAX,
+ XA_MARK_0);
+ if (k <= j)
+ XA_BUG_ON(xa, index != j);
+ else if (k <= i)
+ XA_BUG_ON(xa, index != i);
+ else
+ XA_BUG_ON(xa, entry != NULL);
+ }
+ xa_erase_index(xa, j);
+ XA_BUG_ON(xa, xa_get_mark(xa, j, XA_MARK_0));
+ XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
+ }
+ xa_erase_index(xa, i);
+ XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0));
+ }
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_find_2(struct xarray *xa)
+{
+ void *entry;
+ unsigned long i, j, index;
+
+ xa_for_each(xa, index, entry) {
+ XA_BUG_ON(xa, true);
+ }
+
+ for (i = 0; i < 1024; i++) {
+ xa_store_index(xa, index, GFP_KERNEL);
+ j = 0;
+ xa_for_each(xa, index, entry) {
+ XA_BUG_ON(xa, xa_mk_index(index) != entry);
+ XA_BUG_ON(xa, index != j++);
+ }
+ }
+
+ xa_destroy(xa);
+}
+
+static noinline void check_find_3(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 0);
+ unsigned long i, j, k;
+ void *entry;
+
+ for (i = 0; i < 100; i++) {
+ for (j = 0; j < 100; j++) {
+ rcu_read_lock();
+ for (k = 0; k < 100; k++) {
+ xas_set(&xas, j);
+ xas_for_each_marked(&xas, entry, k, XA_MARK_0)
+ ;
+ if (j > k)
+ XA_BUG_ON(xa,
+ xas.xa_node != XAS_RESTART);
+ }
+ rcu_read_unlock();
+ }
+ xa_store_index(xa, i, GFP_KERNEL);
+ xa_set_mark(xa, i, XA_MARK_0);
+ }
+ xa_destroy(xa);
+}
+
+static noinline void check_find_4(struct xarray *xa)
+{
+ unsigned long index = 0;
+ void *entry;
+
+ xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
+
+ entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
+ XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
+
+ entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
+ XA_BUG_ON(xa, entry);
+
+ xa_erase_index(xa, ULONG_MAX);
+}
+
+static noinline void check_find(struct xarray *xa)
+{
+ unsigned i;
+
+ check_find_1(xa);
+ check_find_2(xa);
+ check_find_3(xa);
+ check_find_4(xa);
+
+ for (i = 2; i < 10; i++)
+ check_multi_find_1(xa, i);
+ check_multi_find_2(xa);
+ check_multi_find_3(xa);
+}
+
+/* See find_swap_entry() in mm/shmem.c */
+static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
+{
+ XA_STATE(xas, xa, 0);
+ unsigned int checked = 0;
+ void *entry;
+
+ rcu_read_lock();
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ if (xas_retry(&xas, entry))
+ continue;
+ if (entry == item)
+ break;
+ checked++;
+ if ((checked % 4) != 0)
+ continue;
+ xas_pause(&xas);
+ }
+ rcu_read_unlock();
+
+ return entry ? xas.xa_index : -1;
+}
+
+static noinline void check_find_entry(struct xarray *xa)
+{
+#ifdef CONFIG_XARRAY_MULTI
+ unsigned int order;
+ unsigned long offset, index;
+
+ for (order = 0; order < 20; order++) {
+ for (offset = 0; offset < (1UL << (order + 3));
+ offset += (1UL << order)) {
+ for (index = 0; index < (1UL << (order + 5));
+ index += (1UL << order)) {
+ xa_store_order(xa, index, order,
+ xa_mk_index(index), GFP_KERNEL);
+ XA_BUG_ON(xa, xa_load(xa, index) !=
+ xa_mk_index(index));
+ XA_BUG_ON(xa, xa_find_entry(xa,
+ xa_mk_index(index)) != index);
+ }
+ XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
+ xa_destroy(xa);
+ }
+ }
+#endif
+
+ XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
+ xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
+ XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
+ XA_BUG_ON(xa, xa_find_entry(xa, xa_mk_index(ULONG_MAX)) != -1);
+ xa_erase_index(xa, ULONG_MAX);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_pause(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 0);
+ void *entry;
+ unsigned int order;
+ unsigned long index = 1;
+ unsigned int count = 0;
+
+ for (order = 0; order < order_limit; order++) {
+ XA_BUG_ON(xa, xa_store_order(xa, index, order,
+ xa_mk_index(index), GFP_KERNEL));
+ index += 1UL << order;
+ }
+
+ rcu_read_lock();
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
+ count++;
+ }
+ rcu_read_unlock();
+ XA_BUG_ON(xa, count != order_limit);
+
+ count = 0;
+ xas_set(&xas, 0);
+ rcu_read_lock();
+ xas_for_each(&xas, entry, ULONG_MAX) {
+ XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
+ count++;
+ xas_pause(&xas);
+ }
+ rcu_read_unlock();
+ XA_BUG_ON(xa, count != order_limit);
+
+ xa_destroy(xa);
+}
+
+static noinline void check_move_tiny(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 0);
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+ rcu_read_lock();
+ XA_BUG_ON(xa, xas_next(&xas) != NULL);
+ XA_BUG_ON(xa, xas_next(&xas) != NULL);
+ rcu_read_unlock();
+ xa_store_index(xa, 0, GFP_KERNEL);
+ rcu_read_lock();
+ xas_set(&xas, 0);
+ XA_BUG_ON(xa, xas_next(&xas) != xa_mk_index(0));
+ XA_BUG_ON(xa, xas_next(&xas) != NULL);
+ xas_set(&xas, 0);
+ XA_BUG_ON(xa, xas_prev(&xas) != xa_mk_index(0));
+ XA_BUG_ON(xa, xas_prev(&xas) != NULL);
+ rcu_read_unlock();
+ xa_erase_index(xa, 0);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_move_max(struct xarray *xa)
+{
+ XA_STATE(xas, xa, 0);
+
+ xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
+ rcu_read_lock();
+ XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
+ XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
+ rcu_read_unlock();
+
+ xas_set(&xas, 0);
+ rcu_read_lock();
+ XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
+ xas_pause(&xas);
+ XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
+ rcu_read_unlock();
+
+ xa_erase_index(xa, ULONG_MAX);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_move_small(struct xarray *xa, unsigned long idx)
+{
+ XA_STATE(xas, xa, 0);
+ unsigned long i;
+
+ xa_store_index(xa, 0, GFP_KERNEL);
+ xa_store_index(xa, idx, GFP_KERNEL);
+
+ rcu_read_lock();
+ for (i = 0; i < idx * 4; i++) {
+ void *entry = xas_next(&xas);
+ if (i <= idx)
+ XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
+ XA_BUG_ON(xa, xas.xa_index != i);
+ if (i == 0 || i == idx)
+ XA_BUG_ON(xa, entry != xa_mk_index(i));
+ else
+ XA_BUG_ON(xa, entry != NULL);
+ }
+ xas_next(&xas);
+ XA_BUG_ON(xa, xas.xa_index != i);
+
+ do {
+ void *entry = xas_prev(&xas);
+ i--;
+ if (i <= idx)
+ XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
+ XA_BUG_ON(xa, xas.xa_index != i);
+ if (i == 0 || i == idx)
+ XA_BUG_ON(xa, entry != xa_mk_index(i));
+ else
+ XA_BUG_ON(xa, entry != NULL);
+ } while (i > 0);
+
+ xas_set(&xas, ULONG_MAX);
+ XA_BUG_ON(xa, xas_next(&xas) != NULL);
+ XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
+ XA_BUG_ON(xa, xas_next(&xas) != xa_mk_value(0));
+ XA_BUG_ON(xa, xas.xa_index != 0);
+ XA_BUG_ON(xa, xas_prev(&xas) != NULL);
+ XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
+ rcu_read_unlock();
+
+ xa_erase_index(xa, 0);
+ xa_erase_index(xa, idx);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_move(struct xarray *xa)
+{
+ XA_STATE(xas, xa, (1 << 16) - 1);
+ unsigned long i;
+
+ for (i = 0; i < (1 << 16); i++)
+ XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
+
+ rcu_read_lock();
+ do {
+ void *entry = xas_prev(&xas);
+ i--;
+ XA_BUG_ON(xa, entry != xa_mk_index(i));
+ XA_BUG_ON(xa, i != xas.xa_index);
+ } while (i != 0);
+
+ XA_BUG_ON(xa, xas_prev(&xas) != NULL);
+ XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
+
+ do {
+ void *entry = xas_next(&xas);
+ XA_BUG_ON(xa, entry != xa_mk_index(i));
+ XA_BUG_ON(xa, i != xas.xa_index);
+ i++;
+ } while (i < (1 << 16));
+ rcu_read_unlock();
+
+ for (i = (1 << 8); i < (1 << 15); i++)
+ xa_erase_index(xa, i);
+
+ i = xas.xa_index;
+
+ rcu_read_lock();
+ do {
+ void *entry = xas_prev(&xas);
+ i--;
+ if ((i < (1 << 8)) || (i >= (1 << 15)))
+ XA_BUG_ON(xa, entry != xa_mk_index(i));
+ else
+ XA_BUG_ON(xa, entry != NULL);
+ XA_BUG_ON(xa, i != xas.xa_index);
+ } while (i != 0);
+
+ XA_BUG_ON(xa, xas_prev(&xas) != NULL);
+ XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
+
+ do {
+ void *entry = xas_next(&xas);
+ if ((i < (1 << 8)) || (i >= (1 << 15)))
+ XA_BUG_ON(xa, entry != xa_mk_index(i));
+ else
+ XA_BUG_ON(xa, entry != NULL);
+ XA_BUG_ON(xa, i != xas.xa_index);
+ i++;
+ } while (i < (1 << 16));
+ rcu_read_unlock();
+
+ xa_destroy(xa);
+
+ check_move_tiny(xa);
+ check_move_max(xa);
+
+ for (i = 0; i < 16; i++)
+ check_move_small(xa, 1UL << i);
+
+ for (i = 2; i < 16; i++)
+ check_move_small(xa, (1UL << i) - 1);
+}
+
+static noinline void xa_store_many_order(struct xarray *xa,
+ unsigned long index, unsigned order)
+{
+ XA_STATE_ORDER(xas, xa, index, order);
+ unsigned int i = 0;
+
+ do {
+ xas_lock(&xas);
+ XA_BUG_ON(xa, xas_find_conflict(&xas));
+ xas_create_range(&xas);
+ if (xas_error(&xas))
+ goto unlock;
+ for (i = 0; i < (1U << order); i++) {
+ XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(index + i)));
+ xas_next(&xas);
+ }
+unlock:
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_KERNEL));
+
+ XA_BUG_ON(xa, xas_error(&xas));
+}
+
+static noinline void check_create_range_1(struct xarray *xa,
+ unsigned long index, unsigned order)
+{
+ unsigned long i;
+
+ xa_store_many_order(xa, index, order);
+ for (i = index; i < index + (1UL << order); i++)
+ xa_erase_index(xa, i);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_create_range_2(struct xarray *xa, unsigned order)
+{
+ unsigned long i;
+ unsigned long nr = 1UL << order;
+
+ for (i = 0; i < nr * nr; i += nr)
+ xa_store_many_order(xa, i, order);
+ for (i = 0; i < nr * nr; i++)
+ xa_erase_index(xa, i);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_create_range_3(void)
+{
+ XA_STATE(xas, NULL, 0);
+ xas_set_err(&xas, -EEXIST);
+ xas_create_range(&xas);
+ XA_BUG_ON(NULL, xas_error(&xas) != -EEXIST);
+}
+
+static noinline void check_create_range_4(struct xarray *xa,
+ unsigned long index, unsigned order)
+{
+ XA_STATE_ORDER(xas, xa, index, order);
+ unsigned long base = xas.xa_index;
+ unsigned long i = 0;
+
+ xa_store_index(xa, index, GFP_KERNEL);
+ do {
+ xas_lock(&xas);
+ xas_create_range(&xas);
+ if (xas_error(&xas))
+ goto unlock;
+ for (i = 0; i < (1UL << order); i++) {
+ void *old = xas_store(&xas, xa_mk_index(base + i));
+ if (xas.xa_index == index)
+ XA_BUG_ON(xa, old != xa_mk_index(base + i));
+ else
+ XA_BUG_ON(xa, old != NULL);
+ xas_next(&xas);
+ }
+unlock:
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_KERNEL));
+
+ XA_BUG_ON(xa, xas_error(&xas));
+
+ for (i = base; i < base + (1UL << order); i++)
+ xa_erase_index(xa, i);
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_create_range_5(struct xarray *xa,
+ unsigned long index, unsigned int order)
+{
+ XA_STATE_ORDER(xas, xa, index, order);
+ unsigned int i;
+
+ xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
+
+ for (i = 0; i < order + 10; i++) {
+ do {
+ xas_lock(&xas);
+ xas_create_range(&xas);
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_KERNEL));
+ }
+
+ xa_destroy(xa);
+}
+
+static noinline void check_create_range(struct xarray *xa)
+{
+ unsigned int order;
+ unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 12 : 1;
+
+ for (order = 0; order < max_order; order++) {
+ check_create_range_1(xa, 0, order);
+ check_create_range_1(xa, 1U << order, order);
+ check_create_range_1(xa, 2U << order, order);
+ check_create_range_1(xa, 3U << order, order);
+ check_create_range_1(xa, 1U << 24, order);
+ if (order < 10)
+ check_create_range_2(xa, order);
+
+ check_create_range_4(xa, 0, order);
+ check_create_range_4(xa, 1U << order, order);
+ check_create_range_4(xa, 2U << order, order);
+ check_create_range_4(xa, 3U << order, order);
+ check_create_range_4(xa, 1U << 24, order);
+
+ check_create_range_4(xa, 1, order);
+ check_create_range_4(xa, (1U << order) + 1, order);
+ check_create_range_4(xa, (2U << order) + 1, order);
+ check_create_range_4(xa, (2U << order) - 1, order);
+ check_create_range_4(xa, (3U << order) + 1, order);
+ check_create_range_4(xa, (3U << order) - 1, order);
+ check_create_range_4(xa, (1U << 24) + 1, order);
+
+ check_create_range_5(xa, 0, order);
+ check_create_range_5(xa, (1U << order), order);
+ }
+
+ check_create_range_3();
+}
+
+static noinline void __check_store_range(struct xarray *xa, unsigned long first,
+ unsigned long last)
+{
+#ifdef CONFIG_XARRAY_MULTI
+ xa_store_range(xa, first, last, xa_mk_index(first), GFP_KERNEL);
+
+ XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_index(first));
+ XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_index(first));
+ XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL);
+ XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL);
+
+ xa_store_range(xa, first, last, NULL, GFP_KERNEL);
+#endif
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_store_range(struct xarray *xa)
+{
+ unsigned long i, j;
+
+ for (i = 0; i < 128; i++) {
+ for (j = i; j < 128; j++) {
+ __check_store_range(xa, i, j);
+ __check_store_range(xa, 128 + i, 128 + j);
+ __check_store_range(xa, 4095 + i, 4095 + j);
+ __check_store_range(xa, 4096 + i, 4096 + j);
+ __check_store_range(xa, 123456 + i, 123456 + j);
+ __check_store_range(xa, (1 << 24) + i, (1 << 24) + j);
+ }
+ }
+}
+
+#ifdef CONFIG_XARRAY_MULTI
+static void check_split_1(struct xarray *xa, unsigned long index,
+ unsigned int order, unsigned int new_order)
+{
+ XA_STATE_ORDER(xas, xa, index, new_order);
+ unsigned int i;
+
+ xa_store_order(xa, index, order, xa, GFP_KERNEL);
+
+ xas_split_alloc(&xas, xa, order, GFP_KERNEL);
+ xas_lock(&xas);
+ xas_split(&xas, xa, order);
+ for (i = 0; i < (1 << order); i += (1 << new_order))
+ __xa_store(xa, index + i, xa_mk_index(index + i), 0);
+ xas_unlock(&xas);
+
+ for (i = 0; i < (1 << order); i++) {
+ unsigned int val = index + (i & ~((1 << new_order) - 1));
+ XA_BUG_ON(xa, xa_load(xa, index + i) != xa_mk_index(val));
+ }
+
+ xa_set_mark(xa, index, XA_MARK_0);
+ XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
+
+ xa_destroy(xa);
+}
+
+static noinline void check_split(struct xarray *xa)
+{
+ unsigned int order, new_order;
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ for (order = 1; order < 2 * XA_CHUNK_SHIFT; order++) {
+ for (new_order = 0; new_order < order; new_order++) {
+ check_split_1(xa, 0, order, new_order);
+ check_split_1(xa, 1UL << order, order, new_order);
+ check_split_1(xa, 3UL << order, order, new_order);
+ }
+ }
+}
+#else
+static void check_split(struct xarray *xa) { }
+#endif
+
+static void check_align_1(struct xarray *xa, char *name)
+{
+ int i;
+ unsigned int id;
+ unsigned long index;
+ void *entry;
+
+ for (i = 0; i < 8; i++) {
+ XA_BUG_ON(xa, xa_alloc(xa, &id, name + i, xa_limit_32b,
+ GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, id != i);
+ }
+ xa_for_each(xa, index, entry)
+ XA_BUG_ON(xa, xa_is_err(entry));
+ xa_destroy(xa);
+}
+
+/*
+ * We should always be able to store without allocating memory after
+ * reserving a slot.
+ */
+static void check_align_2(struct xarray *xa, char *name)
+{
+ int i;
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ for (i = 0; i < 8; i++) {
+ XA_BUG_ON(xa, xa_store(xa, 0, name + i, GFP_KERNEL) != NULL);
+ xa_erase(xa, 0);
+ }
+
+ for (i = 0; i < 8; i++) {
+ XA_BUG_ON(xa, xa_reserve(xa, 0, GFP_KERNEL) != 0);
+ XA_BUG_ON(xa, xa_store(xa, 0, name + i, 0) != NULL);
+ xa_erase(xa, 0);
+ }
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+static noinline void check_align(struct xarray *xa)
+{
+ char name[] = "Motorola 68000";
+
+ check_align_1(xa, name);
+ check_align_1(xa, name + 1);
+ check_align_1(xa, name + 2);
+ check_align_1(xa, name + 3);
+ check_align_2(xa, name);
+}
+
+static LIST_HEAD(shadow_nodes);
+
+static void test_update_node(struct xa_node *node)
+{
+ if (node->count && node->count == node->nr_values) {
+ if (list_empty(&node->private_list))
+ list_add(&shadow_nodes, &node->private_list);
+ } else {
+ if (!list_empty(&node->private_list))
+ list_del_init(&node->private_list);
+ }
+}
+
+static noinline void shadow_remove(struct xarray *xa)
+{
+ struct xa_node *node;
+
+ xa_lock(xa);
+ while ((node = list_first_entry_or_null(&shadow_nodes,
+ struct xa_node, private_list))) {
+ XA_BUG_ON(xa, node->array != xa);
+ list_del_init(&node->private_list);
+ xa_delete_node(node, test_update_node);
+ }
+ xa_unlock(xa);
+}
+
+static noinline void check_workingset(struct xarray *xa, unsigned long index)
+{
+ XA_STATE(xas, xa, index);
+ xas_set_update(&xas, test_update_node);
+
+ do {
+ xas_lock(&xas);
+ xas_store(&xas, xa_mk_value(0));
+ xas_next(&xas);
+ xas_store(&xas, xa_mk_value(1));
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_KERNEL));
+
+ XA_BUG_ON(xa, list_empty(&shadow_nodes));
+
+ xas_lock(&xas);
+ xas_next(&xas);
+ xas_store(&xas, &xas);
+ XA_BUG_ON(xa, !list_empty(&shadow_nodes));
+
+ xas_store(&xas, xa_mk_value(2));
+ xas_unlock(&xas);
+ XA_BUG_ON(xa, list_empty(&shadow_nodes));
+
+ shadow_remove(xa);
+ XA_BUG_ON(xa, !list_empty(&shadow_nodes));
+ XA_BUG_ON(xa, !xa_empty(xa));
+}
+
+/*
+ * Check that the pointer / value / sibling entries are accounted the
+ * way we expect them to be.
+ */
+static noinline void check_account(struct xarray *xa)
+{
+#ifdef CONFIG_XARRAY_MULTI
+ unsigned int order;
+
+ for (order = 1; order < 12; order++) {
+ XA_STATE(xas, xa, 1 << order);
+
+ xa_store_order(xa, 0, order, xa, GFP_KERNEL);
+ rcu_read_lock();
+ xas_load(&xas);
+ XA_BUG_ON(xa, xas.xa_node->count == 0);
+ XA_BUG_ON(xa, xas.xa_node->count > (1 << order));
+ XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
+ rcu_read_unlock();
+
+ xa_store_order(xa, 1 << order, order, xa_mk_index(1UL << order),
+ GFP_KERNEL);
+ XA_BUG_ON(xa, xas.xa_node->count != xas.xa_node->nr_values * 2);
+
+ xa_erase(xa, 1 << order);
+ XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
+
+ xa_erase(xa, 0);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ }
+#endif
+}
+
+static noinline void check_get_order(struct xarray *xa)
+{
+ unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
+ unsigned int order;
+ unsigned long i, j;
+
+ for (i = 0; i < 3; i++)
+ XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
+
+ for (order = 0; order < max_order; order++) {
+ for (i = 0; i < 10; i++) {
+ xa_store_order(xa, i << order, order,
+ xa_mk_index(i << order), GFP_KERNEL);
+ for (j = i << order; j < (i + 1) << order; j++)
+ XA_BUG_ON(xa, xa_get_order(xa, j) != order);
+ xa_erase(xa, i << order);
+ }
+ }
+}
+
+static noinline void check_destroy(struct xarray *xa)
+{
+ unsigned long index;
+
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* Destroying an empty array is a no-op */
+ xa_destroy(xa);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+ /* Destroying an array with a single entry */
+ for (index = 0; index < 1000; index++) {
+ xa_store_index(xa, index, GFP_KERNEL);
+ XA_BUG_ON(xa, xa_empty(xa));
+ xa_destroy(xa);
+ XA_BUG_ON(xa, !xa_empty(xa));
+ }
+
+ /* Destroying an array with a single entry at ULONG_MAX */
+ xa_store(xa, ULONG_MAX, xa, GFP_KERNEL);
+ XA_BUG_ON(xa, xa_empty(xa));
+ xa_destroy(xa);
+ XA_BUG_ON(xa, !xa_empty(xa));
+
+#ifdef CONFIG_XARRAY_MULTI
+ /* Destroying an array with a multi-index entry */
+ xa_store_order(xa, 1 << 11, 11, xa, GFP_KERNEL);
+ XA_BUG_ON(xa, xa_empty(xa));
+ xa_destroy(xa);
+ XA_BUG_ON(xa, !xa_empty(xa));
+#endif
+}
+
+static DEFINE_XARRAY(array);
+
+static int xarray_checks(void)
+{
+ check_xa_err(&array);
+ check_xas_retry(&array);
+ check_xa_load(&array);
+ check_xa_mark(&array);
+ check_xa_shrink(&array);
+ check_xas_erase(&array);
+ check_insert(&array);
+ check_cmpxchg(&array);
+ check_reserve(&array);
+ check_reserve(&xa0);
+ check_multi_store(&array);
+ check_get_order(&array);
+ check_xa_alloc();
+ check_find(&array);
+ check_find_entry(&array);
+ check_pause(&array);
+ check_account(&array);
+ check_destroy(&array);
+ check_move(&array);
+ check_create_range(&array);
+ check_store_range(&array);
+ check_store_iter(&array);
+ check_align(&xa0);
+ check_split(&array);
+
+ check_workingset(&array, 0);
+ check_workingset(&array, 64);
+ check_workingset(&array, 4096);
+
+ printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
+ return (tests_run == tests_passed) ? 0 : -EINVAL;
+}
+
+static void xarray_exit(void)
+{
+}
+
+module_init(xarray_checks);
+module_exit(xarray_exit);
+MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
+MODULE_LICENSE("GPL");