Merging upstream version 6.9.7.

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

23 files changed, 377 insertions, 268 deletions

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 5c845e8d59..daafeb20f9 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -8,11 +8,12 @@ config PARISC
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_SYSCALL_TRACEPOINTS
 	select ARCH_WANT_FRAME_POINTERS
+	select ARCH_HAS_CPU_CACHE_ALIASING
 	select ARCH_HAS_DMA_ALLOC if PA11
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_HAS_STRICT_MODULE_RWX
-	select ARCH_HAS_UBSAN_SANITIZE_ALL
+	select ARCH_HAS_UBSAN
 	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_NO_SG_CHAIN
 	select ARCH_SUPPORTS_HUGETLBFS if PA20
@@ -237,9 +238,9 @@ config PARISC_HUGE_KERNEL
 	def_bool y if !MODULES || UBSAN || FTRACE || COMPILE_TEST
 
 config MLONGCALLS
-	def_bool y if PARISC_HUGE_KERNEL
 	bool "Enable the -mlong-calls compiler option for big kernels" if !PARISC_HUGE_KERNEL
 	depends on PA8X00
+	default PARISC_HUGE_KERNEL
 	help
 	  If you configure the kernel to include many drivers built-in instead
 	  as modules, the kernel executable may become too big, so that the
@@ -254,9 +255,9 @@ config MLONGCALLS
 	  Enabling this option will probably slow down your kernel.
 
 config 64BIT
-	def_bool y if "$(ARCH)" = "parisc64"
 	bool "64-bit kernel" if "$(ARCH)" = "parisc"
 	depends on PA8X00
+	default "$(ARCH)" = "parisc64"
 	help
 	  Enable this if you want to support 64bit kernel on PA-RISC platform.
 
@@ -273,6 +274,7 @@ choice
 
 config PARISC_PAGE_SIZE_4KB
 	bool "4KB"
+	select HAVE_PAGE_SIZE_4KB
 	help
 	  This lets you select the page size of the kernel.  For best
 	  performance, a page size of 16KB is recommended.  For best
@@ -288,10 +290,12 @@ config PARISC_PAGE_SIZE_4KB
 
 config PARISC_PAGE_SIZE_16KB
 	bool "16KB"
+	select HAVE_PAGE_SIZE_16KB
 	depends on PA8X00 && BROKEN && !KFENCE
 
 config PARISC_PAGE_SIZE_64KB
 	bool "64KB"
+	select HAVE_PAGE_SIZE_64KB
 	depends on PA8X00 && BROKEN && !KFENCE
 
 endchoice
diff --git a/arch/parisc/include/asm/cacheflush.h b/arch/parisc/include/asm/cacheflush.h
index ba4c05bc24..8394718870 100644
--- a/arch/parisc/include/asm/cacheflush.h
+++ b/arch/parisc/include/asm/cacheflush.h
@@ -31,18 +31,17 @@ void flush_cache_all_local(void);
 void flush_cache_all(void);
 void flush_cache_mm(struct mm_struct *mm);
 
-void flush_kernel_dcache_page_addr(const void *addr);
-
 #define flush_kernel_dcache_range(start,size) \
 	flush_kernel_dcache_range_asm((start), (start)+(size));
 
+/* The only way to flush a vmap range is to flush whole cache */
 #define ARCH_IMPLEMENTS_FLUSH_KERNEL_VMAP_RANGE 1
 void flush_kernel_vmap_range(void *vaddr, int size);
 void invalidate_kernel_vmap_range(void *vaddr, int size);
 
-#define flush_cache_vmap(start, end)		flush_cache_all()
+void flush_cache_vmap(unsigned long start, unsigned long end);
 #define flush_cache_vmap_early(start, end)	do { } while (0)
-#define flush_cache_vunmap(start, end)		flush_cache_all()
+void flush_cache_vunmap(unsigned long start, unsigned long end);
 
 void flush_dcache_folio(struct folio *folio);
 #define flush_dcache_folio flush_dcache_folio
@@ -77,17 +76,11 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
 void flush_cache_range(struct vm_area_struct *vma,
 		unsigned long start, unsigned long end);
 
-/* defined in pacache.S exported in cache.c used by flush_anon_page */
-void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
-
 #define ARCH_HAS_FLUSH_ANON_PAGE
 void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr);
 
 #define ARCH_HAS_FLUSH_ON_KUNMAP
-static inline void kunmap_flush_on_unmap(const void *addr)
-{
-	flush_kernel_dcache_page_addr(addr);
-}
+void kunmap_flush_on_unmap(const void *addr);
 
 #endif /* _PARISC_CACHEFLUSH_H */
 
diff --git a/arch/parisc/include/asm/cachetype.h b/arch/parisc/include/asm/cachetype.h
new file mode 100644
index 0000000000..e0868a1d3c
--- /dev/null
+++ b/arch/parisc/include/asm/cachetype.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_PARISC_CACHETYPE_H
+#define __ASM_PARISC_CACHETYPE_H
+
+#include <linux/types.h>
+
+#define cpu_dcache_is_aliasing()	true
+
+#endif
diff --git a/arch/parisc/include/asm/page.h b/arch/parisc/include/asm/page.h
index 667e703c0e..4bea2e9579 100644
--- a/arch/parisc/include/asm/page.h
+++ b/arch/parisc/include/asm/page.h
@@ -4,18 +4,11 @@
 
 #include <linux/const.h>
 
-#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
-# define PAGE_SHIFT	12
-#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
-# define PAGE_SHIFT	14
-#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
-# define PAGE_SHIFT	16
-#else
-# error "unknown default kernel page size"
-#endif
+#define PAGE_SHIFT	CONFIG_PAGE_SHIFT
 #define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
 #define PAGE_MASK	(~(PAGE_SIZE-1))
 
+#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 
 #ifndef __ASSEMBLY__
 
diff --git a/arch/parisc/include/asm/parisc-device.h b/arch/parisc/include/asm/parisc-device.h
index 4de3b391d8..7ddd7f4333 100644
--- a/arch/parisc/include/asm/parisc-device.h
+++ b/arch/parisc/include/asm/parisc-device.h
@@ -61,7 +61,7 @@ parisc_get_drvdata(struct parisc_device *d)
 	return dev_get_drvdata(&d->dev);
 }
 
-extern struct bus_type parisc_bus_type;
+extern const struct bus_type parisc_bus_type;
 
 int iosapic_serial_irq(struct parisc_device *dev);
 
diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index 974accac05..babf65751e 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -448,14 +448,17 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
 	return pte;
 }
 
+static inline pte_t ptep_get(pte_t *ptep)
+{
+	return READ_ONCE(*ptep);
+}
+#define ptep_get ptep_get
+
 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 {
 	pte_t pte;
 
-	if (!pte_young(*ptep))
-		return 0;
-
-	pte = *ptep;
+	pte = ptep_get(ptep);
 	if (!pte_young(pte)) {
 		return 0;
 	}
@@ -463,17 +466,10 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned
 	return 1;
 }
 
-struct mm_struct;
-static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
-{
-	pte_t old_pte;
-
-	old_pte = *ptep;
-	set_pte(ptep, __pte(0));
-
-	return old_pte;
-}
+int ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);
+pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);
 
+struct mm_struct;
 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
 	set_pte(ptep, pte_wrprotect(*ptep));
@@ -511,7 +507,8 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
+#define __HAVE_ARCH_PTEP_CLEAR_FLUSH
 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 #define __HAVE_ARCH_PTE_SAME
 
diff --git a/arch/parisc/include/asm/signal.h b/arch/parisc/include/asm/signal.h
index 715c96ba2e..e84883c6b4 100644
--- a/arch/parisc/include/asm/signal.h
+++ b/arch/parisc/include/asm/signal.h
@@ -4,23 +4,11 @@
 
 #include <uapi/asm/signal.h>
 
-#define _NSIG		64
-/* bits-per-word, where word apparently means 'long' not 'int' */
-#define _NSIG_BPW	BITS_PER_LONG
-#define _NSIG_WORDS	(_NSIG / _NSIG_BPW)
-
 # ifndef __ASSEMBLY__
 
 /* Most things should be clean enough to redefine this at will, if care
    is taken to make libc match.  */
 
-typedef unsigned long old_sigset_t;		/* at least 32 bits */
-
-typedef struct {
-	/* next_signal() assumes this is a long - no choice */
-	unsigned long sig[_NSIG_WORDS];
-} sigset_t;
-
 #include <asm/sigcontext.h>
 
 #endif /* !__ASSEMBLY */
diff --git a/arch/parisc/include/uapi/asm/signal.h b/arch/parisc/include/uapi/asm/signal.h
index 8e4895c5ea..40d7a574c5 100644
--- a/arch/parisc/include/uapi/asm/signal.h
+++ b/arch/parisc/include/uapi/asm/signal.h
@@ -57,10 +57,20 @@
 
 #include <asm-generic/signal-defs.h>
 
+#define _NSIG		64
+#define _NSIG_BPW	(sizeof(unsigned long) * 8)
+#define _NSIG_WORDS	(_NSIG / _NSIG_BPW)
+
 # ifndef __ASSEMBLY__
 
 #  include <linux/types.h>
 
+typedef unsigned long old_sigset_t;	/* at least 32 bits */
+
+typedef struct {
+	unsigned long sig[_NSIG_WORDS];
+} sigset_t;
+
 /* Avoid too many header ordering problems.  */
 struct siginfo;
 
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 422f3e1e6d..483bfafd93 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -20,6 +20,7 @@
 #include <linux/sched.h>
 #include <linux/sched/mm.h>
 #include <linux/syscalls.h>
+#include <linux/vmalloc.h>
 #include <asm/pdc.h>
 #include <asm/cache.h>
 #include <asm/cacheflush.h>
@@ -31,20 +32,31 @@
 #include <asm/mmu_context.h>
 #include <asm/cachectl.h>
 
+#define PTR_PAGE_ALIGN_DOWN(addr) PTR_ALIGN_DOWN(addr, PAGE_SIZE)
+
+/*
+ * When nonzero, use _PAGE_ACCESSED bit to try to reduce the number
+ * of page flushes done flush_cache_page_if_present. There are some
+ * pros and cons in using this option. It may increase the risk of
+ * random segmentation faults.
+ */
+#define CONFIG_FLUSH_PAGE_ACCESSED	0
+
 int split_tlb __ro_after_init;
 int dcache_stride __ro_after_init;
 int icache_stride __ro_after_init;
 EXPORT_SYMBOL(dcache_stride);
 
+/* Internal implementation in arch/parisc/kernel/pacache.S */
 void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
 EXPORT_SYMBOL(flush_dcache_page_asm);
 void purge_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
 void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr);
-
-/* Internal implementation in arch/parisc/kernel/pacache.S */
 void flush_data_cache_local(void *);  /* flushes local data-cache only */
 void flush_instruction_cache_local(void); /* flushes local code-cache only */
 
+static void flush_kernel_dcache_page_addr(const void *addr);
+
 /* On some machines (i.e., ones with the Merced bus), there can be
  * only a single PxTLB broadcast at a time; this must be guaranteed
  * by software. We need a spinlock around all TLB flushes to ensure
@@ -321,6 +333,18 @@ __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
 {
 	if (!static_branch_likely(&parisc_has_cache))
 		return;
+
+	/*
+	 * The TLB is the engine of coherence on parisc.  The CPU is
+	 * entitled to speculate any page with a TLB mapping, so here
+	 * we kill the mapping then flush the page along a special flush
+	 * only alias mapping. This guarantees that the page is no-longer
+	 * in the cache for any process and nor may it be speculatively
+	 * read in (until the user or kernel specifically accesses it,
+	 * of course).
+	 */
+	flush_tlb_page(vma, vmaddr);
+
 	preempt_disable();
 	flush_dcache_page_asm(physaddr, vmaddr);
 	if (vma->vm_flags & VM_EXEC)
@@ -328,46 +352,44 @@ __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
 	preempt_enable();
 }
 
-static void flush_user_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
+static void flush_kernel_dcache_page_addr(const void *addr)
 {
-	unsigned long flags, space, pgd, prot;
-#ifdef CONFIG_TLB_PTLOCK
-	unsigned long pgd_lock;
-#endif
+	unsigned long vaddr = (unsigned long)addr;
+	unsigned long flags;
 
-	vmaddr &= PAGE_MASK;
+	/* Purge TLB entry to remove translation on all CPUs */
+	purge_tlb_start(flags);
+	pdtlb(SR_KERNEL, addr);
+	purge_tlb_end(flags);
 
+	/* Use tmpalias flush to prevent data cache move-in */
 	preempt_disable();
+	flush_dcache_page_asm(__pa(vaddr), vaddr);
+	preempt_enable();
+}
 
-	/* Set context for flush */
-	local_irq_save(flags);
-	prot = mfctl(8);
-	space = mfsp(SR_USER);
-	pgd = mfctl(25);
-#ifdef CONFIG_TLB_PTLOCK
-	pgd_lock = mfctl(28);
-#endif
-	switch_mm_irqs_off(NULL, vma->vm_mm, NULL);
-	local_irq_restore(flags);
-
-	flush_user_dcache_range_asm(vmaddr, vmaddr + PAGE_SIZE);
-	if (vma->vm_flags & VM_EXEC)
-		flush_user_icache_range_asm(vmaddr, vmaddr + PAGE_SIZE);
-	flush_tlb_page(vma, vmaddr);
+static void flush_kernel_icache_page_addr(const void *addr)
+{
+	unsigned long vaddr = (unsigned long)addr;
+	unsigned long flags;
 
-	/* Restore previous context */
-	local_irq_save(flags);
-#ifdef CONFIG_TLB_PTLOCK
-	mtctl(pgd_lock, 28);
-#endif
-	mtctl(pgd, 25);
-	mtsp(space, SR_USER);
-	mtctl(prot, 8);
-	local_irq_restore(flags);
+	/* Purge TLB entry to remove translation on all CPUs */
+	purge_tlb_start(flags);
+	pdtlb(SR_KERNEL, addr);
+	purge_tlb_end(flags);
 
+	/* Use tmpalias flush to prevent instruction cache move-in */
+	preempt_disable();
+	flush_icache_page_asm(__pa(vaddr), vaddr);
 	preempt_enable();
 }
 
+void kunmap_flush_on_unmap(const void *addr)
+{
+	flush_kernel_dcache_page_addr(addr);
+}
+EXPORT_SYMBOL(kunmap_flush_on_unmap);
+
 void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
 		unsigned int nr)
 {
@@ -375,13 +397,16 @@ void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
 
 	for (;;) {
 		flush_kernel_dcache_page_addr(kaddr);
-		flush_kernel_icache_page(kaddr);
+		flush_kernel_icache_page_addr(kaddr);
 		if (--nr == 0)
 			break;
 		kaddr += PAGE_SIZE;
 	}
 }
 
+/*
+ * Walk page directory for MM to find PTEP pointer for address ADDR.
+ */
 static inline pte_t *get_ptep(struct mm_struct *mm, unsigned long addr)
 {
 	pte_t *ptep = NULL;
@@ -410,6 +435,41 @@ static inline bool pte_needs_flush(pte_t pte)
 		== (_PAGE_PRESENT | _PAGE_ACCESSED);
 }
 
+/*
+ * Return user physical address. Returns 0 if page is not present.
+ */
+static inline unsigned long get_upa(struct mm_struct *mm, unsigned long addr)
+{
+	unsigned long flags, space, pgd, prot, pa;
+#ifdef CONFIG_TLB_PTLOCK
+	unsigned long pgd_lock;
+#endif
+
+	/* Save context */
+	local_irq_save(flags);
+	prot = mfctl(8);
+	space = mfsp(SR_USER);
+	pgd = mfctl(25);
+#ifdef CONFIG_TLB_PTLOCK
+	pgd_lock = mfctl(28);
+#endif
+
+	/* Set context for lpa_user */
+	switch_mm_irqs_off(NULL, mm, NULL);
+	pa = lpa_user(addr);
+
+	/* Restore previous context */
+#ifdef CONFIG_TLB_PTLOCK
+	mtctl(pgd_lock, 28);
+#endif
+	mtctl(pgd, 25);
+	mtsp(space, SR_USER);
+	mtctl(prot, 8);
+	local_irq_restore(flags);
+
+	return pa;
+}
+
 void flush_dcache_folio(struct folio *folio)
 {
 	struct address_space *mapping = folio_flush_mapping(folio);
@@ -458,50 +518,23 @@ void flush_dcache_folio(struct folio *folio)
 		if (addr + nr * PAGE_SIZE > vma->vm_end)
 			nr = (vma->vm_end - addr) / PAGE_SIZE;
 
-		if (parisc_requires_coherency()) {
-			for (i = 0; i < nr; i++) {
-				pte_t *ptep = get_ptep(vma->vm_mm,
-							addr + i * PAGE_SIZE);
-				if (!ptep)
-					continue;
-				if (pte_needs_flush(*ptep))
-					flush_user_cache_page(vma,
-							addr + i * PAGE_SIZE);
-				/* Optimise accesses to the same table? */
-				pte_unmap(ptep);
-			}
-		} else {
+		if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1))
+					!= (addr & (SHM_COLOUR - 1))) {
+			for (i = 0; i < nr; i++)
+				__flush_cache_page(vma,
+					addr + i * PAGE_SIZE,
+					(pfn + i) * PAGE_SIZE);
 			/*
-			 * The TLB is the engine of coherence on parisc:
-			 * The CPU is entitled to speculate any page
-			 * with a TLB mapping, so here we kill the
-			 * mapping then flush the page along a special
-			 * flush only alias mapping. This guarantees that
-			 * the page is no-longer in the cache for any
-			 * process and nor may it be speculatively read
-			 * in (until the user or kernel specifically
-			 * accesses it, of course)
+			 * Software is allowed to have any number
+			 * of private mappings to a page.
 			 */
-			for (i = 0; i < nr; i++)
-				flush_tlb_page(vma, addr + i * PAGE_SIZE);
-			if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1))
-					!= (addr & (SHM_COLOUR - 1))) {
-				for (i = 0; i < nr; i++)
-					__flush_cache_page(vma,
-						addr + i * PAGE_SIZE,
-						(pfn + i) * PAGE_SIZE);
-				/*
-				 * Software is allowed to have any number
-				 * of private mappings to a page.
-				 */
-				if (!(vma->vm_flags & VM_SHARED))
-					continue;
-				if (old_addr)
-					pr_err("INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n",
-						old_addr, addr, vma->vm_file);
-				if (nr == folio_nr_pages(folio))
-					old_addr = addr;
-			}
+			if (!(vma->vm_flags & VM_SHARED))
+				continue;
+			if (old_addr)
+				pr_err("INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n",
+					old_addr, addr, vma->vm_file);
+			if (nr == folio_nr_pages(folio))
+				old_addr = addr;
 		}
 		WARN_ON(++count == 4096);
 	}
@@ -591,35 +624,28 @@ extern void purge_kernel_dcache_page_asm(unsigned long);
 extern void clear_user_page_asm(void *, unsigned long);
 extern void copy_user_page_asm(void *, void *, unsigned long);
 
-void flush_kernel_dcache_page_addr(const void *addr)
-{
-	unsigned long flags;
-
-	flush_kernel_dcache_page_asm(addr);
-	purge_tlb_start(flags);
-	pdtlb(SR_KERNEL, addr);
-	purge_tlb_end(flags);
-}
-EXPORT_SYMBOL(flush_kernel_dcache_page_addr);
-
 static void flush_cache_page_if_present(struct vm_area_struct *vma,
-	unsigned long vmaddr, unsigned long pfn)
+	unsigned long vmaddr)
 {
+#if CONFIG_FLUSH_PAGE_ACCESSED
 	bool needs_flush = false;
-	pte_t *ptep;
+	pte_t *ptep, pte;
 
-	/*
-	 * The pte check is racy and sometimes the flush will trigger
-	 * a non-access TLB miss. Hopefully, the page has already been
-	 * flushed.
-	 */
 	ptep = get_ptep(vma->vm_mm, vmaddr);
 	if (ptep) {
-		needs_flush = pte_needs_flush(*ptep);
+		pte = ptep_get(ptep);
+		needs_flush = pte_needs_flush(pte);
 		pte_unmap(ptep);
 	}
 	if (needs_flush)
-		flush_cache_page(vma, vmaddr, pfn);
+		__flush_cache_page(vma, vmaddr, PFN_PHYS(pte_pfn(pte)));
+#else
+	struct mm_struct *mm = vma->vm_mm;
+	unsigned long physaddr = get_upa(mm, vmaddr);
+
+	if (physaddr)
+		__flush_cache_page(vma, vmaddr, PAGE_ALIGN_DOWN(physaddr));
+#endif
 }
 
 void copy_user_highpage(struct page *to, struct page *from,
@@ -629,7 +655,7 @@ void copy_user_highpage(struct page *to, struct page *from,
 
 	kfrom = kmap_local_page(from);
 	kto = kmap_local_page(to);
-	flush_cache_page_if_present(vma, vaddr, page_to_pfn(from));
+	__flush_cache_page(vma, vaddr, PFN_PHYS(page_to_pfn(from)));
 	copy_page_asm(kto, kfrom);
 	kunmap_local(kto);
 	kunmap_local(kfrom);
@@ -638,16 +664,17 @@ void copy_user_highpage(struct page *to, struct page *from,
 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 		unsigned long user_vaddr, void *dst, void *src, int len)
 {
-	flush_cache_page_if_present(vma, user_vaddr, page_to_pfn(page));
+	__flush_cache_page(vma, user_vaddr, PFN_PHYS(page_to_pfn(page)));
 	memcpy(dst, src, len);
-	flush_kernel_dcache_range_asm((unsigned long)dst, (unsigned long)dst + len);
+	flush_kernel_dcache_page_addr(PTR_PAGE_ALIGN_DOWN(dst));
 }
 
 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
 		unsigned long user_vaddr, void *dst, void *src, int len)
 {
-	flush_cache_page_if_present(vma, user_vaddr, page_to_pfn(page));
+	__flush_cache_page(vma, user_vaddr, PFN_PHYS(page_to_pfn(page)));
 	memcpy(dst, src, len);
+	flush_kernel_dcache_page_addr(PTR_PAGE_ALIGN_DOWN(src));
 }
 
 /* __flush_tlb_range()
@@ -681,32 +708,10 @@ int __flush_tlb_range(unsigned long sid, unsigned long start,
 
 static void flush_cache_pages(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 {
-	unsigned long addr, pfn;
-	pte_t *ptep;
-
-	for (addr = start; addr < end; addr += PAGE_SIZE) {
-		bool needs_flush = false;
-		/*
-		 * The vma can contain pages that aren't present. Although
-		 * the pte search is expensive, we need the pte to find the
-		 * page pfn and to check whether the page should be flushed.
-		 */
-		ptep = get_ptep(vma->vm_mm, addr);
-		if (ptep) {
-			needs_flush = pte_needs_flush(*ptep);
-			pfn = pte_pfn(*ptep);
-			pte_unmap(ptep);
-		}
-		if (needs_flush) {
-			if (parisc_requires_coherency()) {
-				flush_user_cache_page(vma, addr);
-			} else {
-				if (WARN_ON(!pfn_valid(pfn)))
-					return;
-				__flush_cache_page(vma, addr, PFN_PHYS(pfn));
-			}
-		}
-	}
+	unsigned long addr;
+
+	for (addr = start; addr < end; addr += PAGE_SIZE)
+		flush_cache_page_if_present(vma, addr);
 }
 
 static inline unsigned long mm_total_size(struct mm_struct *mm)
@@ -757,21 +762,19 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned
 		if (WARN_ON(IS_ENABLED(CONFIG_SMP) && arch_irqs_disabled()))
 			return;
 		flush_tlb_range(vma, start, end);
-		flush_cache_all();
+		if (vma->vm_flags & VM_EXEC)
+			flush_cache_all();
+		else
+			flush_data_cache();
 		return;
 	}
 
-	flush_cache_pages(vma, start, end);
+	flush_cache_pages(vma, start & PAGE_MASK, end);
 }
 
 void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
 {
-	if (WARN_ON(!pfn_valid(pfn)))
-		return;
-	if (parisc_requires_coherency())
-		flush_user_cache_page(vma, vmaddr);
-	else
-		__flush_cache_page(vma, vmaddr, PFN_PHYS(pfn));
+	__flush_cache_page(vma, vmaddr, PFN_PHYS(pfn));
 }
 
 void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
@@ -779,34 +782,133 @@ void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned lon
 	if (!PageAnon(page))
 		return;
 
-	if (parisc_requires_coherency()) {
-		if (vma->vm_flags & VM_SHARED)
-			flush_data_cache();
-		else
-			flush_user_cache_page(vma, vmaddr);
+	__flush_cache_page(vma, vmaddr, PFN_PHYS(page_to_pfn(page)));
+}
+
+int ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr,
+			   pte_t *ptep)
+{
+	pte_t pte = ptep_get(ptep);
+
+	if (!pte_young(pte))
+		return 0;
+	set_pte(ptep, pte_mkold(pte));
+#if CONFIG_FLUSH_PAGE_ACCESSED
+	__flush_cache_page(vma, addr, PFN_PHYS(pte_pfn(pte)));
+#endif
+	return 1;
+}
+
+/*
+ * After a PTE is cleared, we have no way to flush the cache for
+ * the physical page. On PA8800 and PA8900 processors, these lines
+ * can cause random cache corruption. Thus, we must flush the cache
+ * as well as the TLB when clearing a PTE that's valid.
+ */
+pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long addr,
+		       pte_t *ptep)
+{
+	struct mm_struct *mm = (vma)->vm_mm;
+	pte_t pte = ptep_get_and_clear(mm, addr, ptep);
+	unsigned long pfn = pte_pfn(pte);
+
+	if (pfn_valid(pfn))
+		__flush_cache_page(vma, addr, PFN_PHYS(pfn));
+	else if (pte_accessible(mm, pte))
+		flush_tlb_page(vma, addr);
+
+	return pte;
+}
+
+/*
+ * The physical address for pages in the ioremap case can be obtained
+ * from the vm_struct struct. I wasn't able to successfully handle the
+ * vmalloc and vmap cases. We have an array of struct page pointers in
+ * the uninitialized vmalloc case but the flush failed using page_to_pfn.
+ */
+void flush_cache_vmap(unsigned long start, unsigned long end)
+{
+	unsigned long addr, physaddr;
+	struct vm_struct *vm;
+
+	/* Prevent cache move-in */
+	flush_tlb_kernel_range(start, end);
+
+	if (end - start >= parisc_cache_flush_threshold) {
+		flush_cache_all();
 		return;
 	}
 
-	flush_tlb_page(vma, vmaddr);
-	preempt_disable();
-	flush_dcache_page_asm(page_to_phys(page), vmaddr);
-	preempt_enable();
+	if (WARN_ON_ONCE(!is_vmalloc_addr((void *)start))) {
+		flush_cache_all();
+		return;
+	}
+
+	vm = find_vm_area((void *)start);
+	if (WARN_ON_ONCE(!vm)) {
+		flush_cache_all();
+		return;
+	}
+
+	/* The physical addresses of IOREMAP regions are contiguous */
+	if (vm->flags & VM_IOREMAP) {
+		physaddr = vm->phys_addr;
+		for (addr = start; addr < end; addr += PAGE_SIZE) {
+			preempt_disable();
+			flush_dcache_page_asm(physaddr, start);
+			flush_icache_page_asm(physaddr, start);
+			preempt_enable();
+			physaddr += PAGE_SIZE;
+		}
+		return;
+	}
+
+	flush_cache_all();
 }
+EXPORT_SYMBOL(flush_cache_vmap);
 
+/*
+ * The vm_struct has been retired and the page table is set up. The
+ * last page in the range is a guard page. Its physical address can't
+ * be determined using lpa, so there is no way to flush the range
+ * using flush_dcache_page_asm.
+ */
+void flush_cache_vunmap(unsigned long start, unsigned long end)
+{
+	/* Prevent cache move-in */
+	flush_tlb_kernel_range(start, end);
+	flush_data_cache();
+}
+EXPORT_SYMBOL(flush_cache_vunmap);
+
+/*
+ * On systems with PA8800/PA8900 processors, there is no way to flush
+ * a vmap range other than using the architected loop to flush the
+ * entire cache. The page directory is not set up, so we can't use
+ * fdc, etc. FDCE/FICE don't work to flush a portion of the cache.
+ * L2 is physically indexed but FDCE/FICE instructions in virtual
+ * mode output their virtual address on the core bus, not their
+ * real address. As a result, the L2 cache index formed from the
+ * virtual address will most likely not be the same as the L2 index
+ * formed from the real address.
+ */
 void flush_kernel_vmap_range(void *vaddr, int size)
 {
 	unsigned long start = (unsigned long)vaddr;
 	unsigned long end = start + size;
 
-	if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
-	    (unsigned long)size >= parisc_cache_flush_threshold) {
-		flush_tlb_kernel_range(start, end);
-		flush_data_cache();
+	flush_tlb_kernel_range(start, end);
+
+	if (!static_branch_likely(&parisc_has_dcache))
+		return;
+
+	/* If interrupts are disabled, we can only do local flush */
+	if (WARN_ON(IS_ENABLED(CONFIG_SMP) && arch_irqs_disabled())) {
+		flush_data_cache_local(NULL);
 		return;
 	}
 
-	flush_kernel_dcache_range_asm(start, end);
-	flush_tlb_kernel_range(start, end);
+	flush_data_cache();
 }
 EXPORT_SYMBOL(flush_kernel_vmap_range);
 
@@ -818,15 +920,18 @@ void invalidate_kernel_vmap_range(void *vaddr, int size)
 	/* Ensure DMA is complete */
 	asm_syncdma();
 
-	if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
-	    (unsigned long)size >= parisc_cache_flush_threshold) {
-		flush_tlb_kernel_range(start, end);
-		flush_data_cache();
+	flush_tlb_kernel_range(start, end);
+
+	if (!static_branch_likely(&parisc_has_dcache))
+		return;
+
+	/* If interrupts are disabled, we can only do local flush */
+	if (WARN_ON(IS_ENABLED(CONFIG_SMP) && arch_irqs_disabled())) {
+		flush_data_cache_local(NULL);
 		return;
 	}
 
-	purge_kernel_dcache_range_asm(start, end);
-	flush_tlb_kernel_range(start, end);
+	flush_data_cache();
 }
 EXPORT_SYMBOL(invalidate_kernel_vmap_range);
 
diff --git a/arch/parisc/kernel/drivers.c b/arch/parisc/kernel/drivers.c
index c7ff339732..ac19d685e4 100644
--- a/arch/parisc/kernel/drivers.c
+++ b/arch/parisc/kernel/drivers.c
@@ -618,7 +618,7 @@ static struct attribute *parisc_device_attrs[] = {
 };
 ATTRIBUTE_GROUPS(parisc_device);
 
-struct bus_type parisc_bus_type = {
+const struct bus_type parisc_bus_type = {
 	.name = "parisc",
 	.match = parisc_generic_match,
 	.uevent = parisc_uevent,
diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
index 621a4b386a..c91f9c2e61 100644
--- a/arch/parisc/kernel/ftrace.c
+++ b/arch/parisc/kernel/ftrace.c
@@ -206,6 +206,9 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 	struct kprobe *p;
 	int bit;
 
+	if (unlikely(kprobe_ftrace_disabled))
+		return;
+
 	bit = ftrace_test_recursion_trylock(ip, parent_ip);
 	if (bit < 0)
 		return;
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index 2f81bfd4f1..dff66be65d 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -498,7 +498,7 @@ asmlinkage void do_cpu_irq_mask(struct pt_regs *regs)
 
 	old_regs = set_irq_regs(regs);
 	local_irq_disable();
-	irq_enter();
+	irq_enter_rcu();
 
 	eirr_val = mfctl(23) & cpu_eiem & per_cpu(local_ack_eiem, cpu);
 	if (!eirr_val)
@@ -533,7 +533,7 @@ asmlinkage void do_cpu_irq_mask(struct pt_regs *regs)
 #endif /* CONFIG_IRQSTACKS */
 
  out:
-	irq_exit();
+	irq_exit_rcu();
 	set_irq_regs(old_regs);
 	return;
 
diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
index a8e75e5b88..71e596ca5a 100644
--- a/arch/parisc/kernel/unaligned.c
+++ b/arch/parisc/kernel/unaligned.c
@@ -396,6 +396,13 @@ void handle_unaligned(struct pt_regs *regs)
 
 		if (!unaligned_enabled)
 			goto force_sigbus;
+	} else {
+		static DEFINE_RATELIMIT_STATE(kernel_ratelimit, 5 * HZ, 5);
+		if (!(current->thread.flags & PARISC_UAC_NOPRINT) &&
+			__ratelimit(&kernel_ratelimit))
+			pr_warn("Kernel: unaligned access to " RFMT " in %pS "
+					"(iir " RFMT ")\n",
+				regs->ior, (void *)regs->iaoq[0], regs->iir);
 	}
 
 	/* handle modification - OK, it's ugly, see the instruction manual */
diff --git a/arch/parisc/math-emu/dfsqrt.c b/arch/parisc/math-emu/dfsqrt.c
index 63d339c81c..e3a3a19b96 100644
--- a/arch/parisc/math-emu/dfsqrt.c
+++ b/arch/parisc/math-emu/dfsqrt.c
@@ -15,7 +15,7 @@
  *	Double Floating-point Square Root
  *
  *  External Interfaces:
- *	dbl_fsqrt(srcptr,nullptr,dstptr,status)
+ *	dbl_fsqrt(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -37,7 +37,7 @@
 unsigned int
 dbl_fsqrt(
 	    dbl_floating_point *srcptr,
-	    unsigned int *nullptr,
+	    unsigned int *_nullptr,
 	    dbl_floating_point *dstptr,
 	    unsigned int *status)
 {
diff --git a/arch/parisc/math-emu/fcnvff.c b/arch/parisc/math-emu/fcnvff.c
index 0530e61277..61e489704c 100644
--- a/arch/parisc/math-emu/fcnvff.c
+++ b/arch/parisc/math-emu/fcnvff.c
@@ -16,8 +16,8 @@
  *	Double Floating-point to Single Floating-point
  *
  *  External Interfaces:
- *	dbl_to_sgl_fcnvff(srcptr,nullptr,dstptr,status)
- *	sgl_to_dbl_fcnvff(srcptr,nullptr,dstptr,status)
+ *	dbl_to_sgl_fcnvff(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_dbl_fcnvff(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -40,7 +40,7 @@
 int
 sgl_to_dbl_fcnvff(
 	    sgl_floating_point *srcptr,
-	    unsigned int *nullptr,
+	    unsigned int *_nullptr,
 	    dbl_floating_point *dstptr,
 	    unsigned int *status)
 {
@@ -127,7 +127,7 @@ sgl_to_dbl_fcnvff(
 int
 dbl_to_sgl_fcnvff(
 		    dbl_floating_point *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    sgl_floating_point *dstptr,
 		    unsigned int *status)
 {
diff --git a/arch/parisc/math-emu/fcnvfu.c b/arch/parisc/math-emu/fcnvfu.c
index c971618a6f..c31790ceec 100644
--- a/arch/parisc/math-emu/fcnvfu.c
+++ b/arch/parisc/math-emu/fcnvfu.c
@@ -15,10 +15,10 @@
  *	Floating-point to Unsigned Fixed-point Converts
  *
  *  External Interfaces:
- *	dbl_to_dbl_fcnvfu(srcptr,nullptr,dstptr,status)
- *	dbl_to_sgl_fcnvfu(srcptr,nullptr,dstptr,status)
- *	sgl_to_dbl_fcnvfu(srcptr,nullptr,dstptr,status)
- *	sgl_to_sgl_fcnvfu(srcptr,nullptr,dstptr,status)
+ *	dbl_to_dbl_fcnvfu(srcptr,_nullptr,dstptr,status)
+ *	dbl_to_sgl_fcnvfu(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_dbl_fcnvfu(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_sgl_fcnvfu(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -45,7 +45,7 @@
 int
 sgl_to_sgl_fcnvfu(
 			sgl_floating_point *srcptr,
-			unsigned int *nullptr,
+			unsigned int *_nullptr,
 			unsigned int *dstptr,
 			unsigned int *status)
 {
@@ -166,7 +166,7 @@ sgl_to_sgl_fcnvfu(
 int
 sgl_to_dbl_fcnvfu(
 		    sgl_floating_point *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    dbl_unsigned *dstptr,
 		    unsigned int *status)
 {
@@ -285,7 +285,7 @@ sgl_to_dbl_fcnvfu(
  */
 /*ARGSUSED*/
 int
-dbl_to_sgl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr,
+dbl_to_sgl_fcnvfu (dbl_floating_point * srcptr, unsigned int *_nullptr,
 		   unsigned int *dstptr, unsigned int *status)
 {
 	register unsigned int srcp1, srcp2, result;
@@ -408,7 +408,7 @@ dbl_to_sgl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr,
  */
 /*ARGSUSED*/
 int
-dbl_to_dbl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr,
+dbl_to_dbl_fcnvfu (dbl_floating_point * srcptr, unsigned int *_nullptr,
 		   dbl_unsigned * dstptr, unsigned int *status)
 {
 	register int src_exponent;
diff --git a/arch/parisc/math-emu/fcnvfut.c b/arch/parisc/math-emu/fcnvfut.c
index 5b657f8525..2cf1daf3b7 100644
--- a/arch/parisc/math-emu/fcnvfut.c
+++ b/arch/parisc/math-emu/fcnvfut.c
@@ -15,10 +15,10 @@
  *	Floating-point to Unsigned Fixed-point Converts with Truncation
  *
  *  External Interfaces:
- *	dbl_to_dbl_fcnvfut(srcptr,nullptr,dstptr,status)
- *	dbl_to_sgl_fcnvfut(srcptr,nullptr,dstptr,status)
- *	sgl_to_dbl_fcnvfut(srcptr,nullptr,dstptr,status)
- *	sgl_to_sgl_fcnvfut(srcptr,nullptr,dstptr,status)
+ *	dbl_to_dbl_fcnvfut(srcptr,_nullptr,dstptr,status)
+ *	dbl_to_sgl_fcnvfut(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_dbl_fcnvfut(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_sgl_fcnvfut(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -44,7 +44,7 @@
  */
 /*ARGSUSED*/
 int
-sgl_to_sgl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr,
+sgl_to_sgl_fcnvfut (sgl_floating_point * srcptr, unsigned int *_nullptr,
 		    unsigned int *dstptr, unsigned int *status)
 {
 	register unsigned int src, result;
@@ -113,7 +113,7 @@ sgl_to_sgl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr,
  */
 /*ARGSUSED*/
 int
-sgl_to_dbl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr,
+sgl_to_dbl_fcnvfut (sgl_floating_point * srcptr, unsigned int *_nullptr,
 		    dbl_unsigned * dstptr, unsigned int *status)
 {
 	register int src_exponent;
@@ -183,7 +183,7 @@ sgl_to_dbl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr,
  */
 /*ARGSUSED*/
 int
-dbl_to_sgl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr,
+dbl_to_sgl_fcnvfut (dbl_floating_point * srcptr, unsigned int *_nullptr,
 		    unsigned int *dstptr, unsigned int *status)
 {
 	register unsigned int srcp1, srcp2, result;
@@ -252,7 +252,7 @@ dbl_to_sgl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr,
  */
 /*ARGSUSED*/
 int
-dbl_to_dbl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr,
+dbl_to_dbl_fcnvfut (dbl_floating_point * srcptr, unsigned int *_nullptr,
 		    dbl_unsigned * dstptr, unsigned int *status)
 {
 	register int src_exponent;
diff --git a/arch/parisc/math-emu/fcnvfx.c b/arch/parisc/math-emu/fcnvfx.c
index 5e153078d8..99bd614794 100644
--- a/arch/parisc/math-emu/fcnvfx.c
+++ b/arch/parisc/math-emu/fcnvfx.c
@@ -18,10 +18,10 @@
  *	Double Floating-point to Double Fixed-point 
  *
  *  External Interfaces:
- *	dbl_to_dbl_fcnvfx(srcptr,nullptr,dstptr,status)
- *	dbl_to_sgl_fcnvfx(srcptr,nullptr,dstptr,status)
- *	sgl_to_dbl_fcnvfx(srcptr,nullptr,dstptr,status)
- *	sgl_to_sgl_fcnvfx(srcptr,nullptr,dstptr,status)
+ *	dbl_to_dbl_fcnvfx(srcptr,_nullptr,dstptr,status)
+ *	dbl_to_sgl_fcnvfx(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_dbl_fcnvfx(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_sgl_fcnvfx(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -44,7 +44,7 @@
 int
 sgl_to_sgl_fcnvfx(
 		    sgl_floating_point *srcptr,
-		    sgl_floating_point *nullptr,
+		    sgl_floating_point *_nullptr,
 		    int *dstptr,
 		    sgl_floating_point *status)
 {
@@ -141,7 +141,7 @@ sgl_to_sgl_fcnvfx(
 int
 sgl_to_dbl_fcnvfx(
 		sgl_floating_point *srcptr,
-		unsigned int *nullptr,
+		unsigned int *_nullptr,
 		dbl_integer *dstptr,
 		unsigned int *status)
 {
@@ -262,7 +262,7 @@ sgl_to_dbl_fcnvfx(
 int
 dbl_to_sgl_fcnvfx(
 		    dbl_floating_point *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    int *dstptr,
 		    unsigned int *status)
 {
@@ -373,7 +373,7 @@ dbl_to_sgl_fcnvfx(
 int
 dbl_to_dbl_fcnvfx(
 		    dbl_floating_point *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    dbl_integer *dstptr,
 		    unsigned int *status)
 {
diff --git a/arch/parisc/math-emu/fcnvfxt.c b/arch/parisc/math-emu/fcnvfxt.c
index ebec31e40d..3b7cc62257 100644
--- a/arch/parisc/math-emu/fcnvfxt.c
+++ b/arch/parisc/math-emu/fcnvfxt.c
@@ -18,10 +18,10 @@
  *	Double Floating-point to Double Fixed-point /w truncated result
  *
  *  External Interfaces:
- *	dbl_to_dbl_fcnvfxt(srcptr,nullptr,dstptr,status)
- *	dbl_to_sgl_fcnvfxt(srcptr,nullptr,dstptr,status)
- *	sgl_to_dbl_fcnvfxt(srcptr,nullptr,dstptr,status)
- *	sgl_to_sgl_fcnvfxt(srcptr,nullptr,dstptr,status)
+ *	dbl_to_dbl_fcnvfxt(srcptr,_nullptr,dstptr,status)
+ *	dbl_to_sgl_fcnvfxt(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_dbl_fcnvfxt(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_sgl_fcnvfxt(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -45,7 +45,7 @@
 int
 sgl_to_sgl_fcnvfxt(
 		    sgl_floating_point *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    int *dstptr,
 		    unsigned int *status)
 {
@@ -109,7 +109,7 @@ sgl_to_sgl_fcnvfxt(
 int
 sgl_to_dbl_fcnvfxt(
 		    sgl_floating_point *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    dbl_integer *dstptr,
 		    unsigned int *status)
 {
@@ -183,7 +183,7 @@ sgl_to_dbl_fcnvfxt(
 int
 dbl_to_sgl_fcnvfxt(
 			dbl_floating_point *srcptr,
-			unsigned int *nullptr,
+			unsigned int *_nullptr,
 			int *dstptr,
 			unsigned int *status)
 {
@@ -248,7 +248,7 @@ dbl_to_sgl_fcnvfxt(
 int
 dbl_to_dbl_fcnvfxt(
 			dbl_floating_point *srcptr,
-			unsigned int *nullptr,
+			unsigned int *_nullptr,
 			dbl_integer *dstptr,
 			unsigned int *status)
 {
diff --git a/arch/parisc/math-emu/fcnvuf.c b/arch/parisc/math-emu/fcnvuf.c
index c54978a0ac..c166feb570 100644
--- a/arch/parisc/math-emu/fcnvuf.c
+++ b/arch/parisc/math-emu/fcnvuf.c
@@ -15,10 +15,10 @@
  *	Fixed point to Floating-point Converts
  *
  *  External Interfaces:
- *	dbl_to_dbl_fcnvuf(srcptr,nullptr,dstptr,status)
- *	dbl_to_sgl_fcnvuf(srcptr,nullptr,dstptr,status)
- *	sgl_to_dbl_fcnvuf(srcptr,nullptr,dstptr,status)
- *	sgl_to_sgl_fcnvuf(srcptr,nullptr,dstptr,status)
+ *	dbl_to_dbl_fcnvuf(srcptr,_nullptr,dstptr,status)
+ *	dbl_to_sgl_fcnvuf(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_dbl_fcnvuf(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_sgl_fcnvuf(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -45,7 +45,7 @@
 int
 sgl_to_sgl_fcnvuf(
 			unsigned int *srcptr,
-			unsigned int *nullptr,
+			unsigned int *_nullptr,
 			sgl_floating_point *dstptr,
 			unsigned int *status)
 {
@@ -104,7 +104,7 @@ sgl_to_sgl_fcnvuf(
 int
 sgl_to_dbl_fcnvuf(
 			unsigned int *srcptr,
-			unsigned int *nullptr,
+			unsigned int *_nullptr,
 			dbl_floating_point *dstptr,
 			unsigned int *status)
 {
@@ -145,7 +145,7 @@ sgl_to_dbl_fcnvuf(
 int
 dbl_to_sgl_fcnvuf(
 			dbl_unsigned *srcptr,
-			unsigned int *nullptr,
+			unsigned int *_nullptr,
 			sgl_floating_point *dstptr,
 			unsigned int *status)
 {
@@ -227,7 +227,7 @@ dbl_to_sgl_fcnvuf(
 int
 dbl_to_dbl_fcnvuf(
 		    dbl_unsigned *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    dbl_floating_point *dstptr,
 		    unsigned int *status)
 {
diff --git a/arch/parisc/math-emu/fcnvxf.c b/arch/parisc/math-emu/fcnvxf.c
index 6940179714..11bc1e8a13 100644
--- a/arch/parisc/math-emu/fcnvxf.c
+++ b/arch/parisc/math-emu/fcnvxf.c
@@ -18,10 +18,10 @@
  *	Double Fixed-point to Double Floating-point 
  *
  *  External Interfaces:
- *	dbl_to_dbl_fcnvxf(srcptr,nullptr,dstptr,status)
- *	dbl_to_sgl_fcnvxf(srcptr,nullptr,dstptr,status)
- *	sgl_to_dbl_fcnvxf(srcptr,nullptr,dstptr,status)
- *	sgl_to_sgl_fcnvxf(srcptr,nullptr,dstptr,status)
+ *	dbl_to_dbl_fcnvxf(srcptr,_nullptr,dstptr,status)
+ *	dbl_to_sgl_fcnvxf(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_dbl_fcnvxf(srcptr,_nullptr,dstptr,status)
+ *	sgl_to_sgl_fcnvxf(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -44,7 +44,7 @@
 int
 sgl_to_sgl_fcnvxf(
 		    int *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    sgl_floating_point *dstptr,
 		    unsigned int *status)
 {
@@ -115,7 +115,7 @@ sgl_to_sgl_fcnvxf(
 int
 sgl_to_dbl_fcnvxf(
 		    int *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    dbl_floating_point *dstptr,
 		    unsigned int *status)
 {
@@ -166,7 +166,7 @@ sgl_to_dbl_fcnvxf(
 int
 dbl_to_sgl_fcnvxf(
 			dbl_integer *srcptr,
-			unsigned int *nullptr,
+			unsigned int *_nullptr,
 			sgl_floating_point *dstptr,
 			unsigned int *status)
 {
@@ -271,7 +271,7 @@ dbl_to_sgl_fcnvxf(
 int
 dbl_to_dbl_fcnvxf(
 		    dbl_integer *srcptr,
-		    unsigned int *nullptr,
+		    unsigned int *_nullptr,
 		    dbl_floating_point *dstptr,
 		    unsigned int *status)
 {
diff --git a/arch/parisc/math-emu/frnd.c b/arch/parisc/math-emu/frnd.c
index 0b0e8493e0..825d89650c 100644
--- a/arch/parisc/math-emu/frnd.c
+++ b/arch/parisc/math-emu/frnd.c
@@ -14,8 +14,8 @@
  *	Quad Floating-point Round to Integer (returns unimplemented)
  *
  *  External Interfaces:
- *	dbl_frnd(srcptr,nullptr,dstptr,status)
- *	sgl_frnd(srcptr,nullptr,dstptr,status)
+ *	dbl_frnd(srcptr,_nullptr,dstptr,status)
+ *	sgl_frnd(srcptr,_nullptr,dstptr,status)
  *
  * END_DESC
 */
@@ -33,7 +33,7 @@
 /*ARGSUSED*/
 int
 sgl_frnd(sgl_floating_point *srcptr,
-	unsigned int *nullptr,
+	unsigned int *_nullptr,
 	sgl_floating_point *dstptr,
 	unsigned int *status)
 {
@@ -138,7 +138,7 @@ sgl_frnd(sgl_floating_point *srcptr,
 int
 dbl_frnd(
 	dbl_floating_point *srcptr,
-	unsigned int *nullptr,
+	unsigned int *_nullptr,
 	dbl_floating_point *dstptr,
 	unsigned int *status)
 {
diff --git a/arch/parisc/math-emu/sfsqrt.c b/arch/parisc/math-emu/sfsqrt.c
index bd6a84f468..8e9e023e7b 100644
--- a/arch/parisc/math-emu/sfsqrt.c
+++ b/arch/parisc/math-emu/sfsqrt.c
@@ -15,7 +15,7 @@
  *	Single Floating-point Square Root
  *
  *  External Interfaces:
- *	sgl_fsqrt(srcptr,nullptr,dstptr,status)
+ *	sgl_fsqrt(srcptr,_nullptr,dstptr,status)
  *
  *  Internal Interfaces:
  *
@@ -37,7 +37,7 @@
 unsigned int
 sgl_fsqrt(
     sgl_floating_point *srcptr,
-    unsigned int *nullptr,
+    unsigned int *_nullptr,
     sgl_floating_point *dstptr,
     unsigned int *status)
 {