From 7575a49f209190ca640e0da792565a1bcb641f3e Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Fri, 23 Mar 2007 21:36:37 +0000
Subject: [PATCH] [MIPS] Implement flush_anon_page().

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
 arch/mips/mm/cache.c          | 16 +++++++++++++++-
 arch/mips/mm/init.c           |  4 ++--
 include/asm-mips/cacheflush.h | 12 ++++++++++++
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 31819c58bf..4e8f1b6833 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -3,7 +3,8 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 1994 - 2003 by Ralf Baechle
+ * Copyright (C) 1994 - 2003, 07 by Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2007 MIPS Technologies, Inc.
  */
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -88,6 +89,19 @@ void __flush_dcache_page(struct page *page)
 
 EXPORT_SYMBOL(__flush_dcache_page);
 
+void __flush_anon_page(struct page *page, unsigned long vmaddr)
+{
+	if (pages_do_alias((unsigned long)page_address(page), vmaddr)) {
+		void *kaddr;
+
+		kaddr = kmap_coherent(page, vmaddr);
+		flush_data_cache_page((unsigned long)kaddr);
+		kunmap_coherent(kaddr);
+	}
+}
+
+EXPORT_SYMBOL(__flush_anon_page);
+
 void __update_cache(struct vm_area_struct *vma, unsigned long address,
 	pte_t pte)
 {
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 25abe91da4..e9951c0e68 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -123,7 +123,7 @@ static void __init kmap_coherent_init(void)
 static inline void kmap_coherent_init(void) {}
 #endif
 
-static inline void *kmap_coherent(struct page *page, unsigned long addr)
+void *kmap_coherent(struct page *page, unsigned long addr)
 {
 	enum fixed_addresses idx;
 	unsigned long vaddr, flags, entrylo;
@@ -177,7 +177,7 @@ static inline void *kmap_coherent(struct page *page, unsigned long addr)
 
 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
 
-static inline void kunmap_coherent(struct page *page)
+void kunmap_coherent(struct page *page)
 {
 #ifndef CONFIG_MIPS_MT_SMTC
 	unsigned int wired;
diff --git a/include/asm-mips/cacheflush.h b/include/asm-mips/cacheflush.h
index 0ddada3bb0..28d907d434 100644
--- a/include/asm-mips/cacheflush.h
+++ b/include/asm-mips/cacheflush.h
@@ -48,6 +48,15 @@ static inline void flush_dcache_page(struct page *page)
 #define flush_dcache_mmap_lock(mapping)		do { } while (0)
 #define flush_dcache_mmap_unlock(mapping)	do { } while (0)
 
+#define ARCH_HAS_FLUSH_ANON_PAGE
+extern void __flush_anon_page(struct page *, unsigned long);
+static inline void flush_anon_page(struct vm_area_struct *vma,
+	struct page *page, unsigned long vmaddr)
+{
+	if (cpu_has_dc_aliases && PageAnon(page))
+		__flush_anon_page(page, vmaddr);
+}
+
 static inline void flush_icache_page(struct vm_area_struct *vma,
 	struct page *page)
 {
@@ -86,4 +95,7 @@ extern void (*flush_data_cache_page)(unsigned long addr);
 /* Run kernel code uncached, useful for cache probing functions. */
 unsigned long __init run_uncached(void *func);
 
+extern void *kmap_coherent(struct page *page, unsigned long addr);
+extern void kunmap_coherent(struct page *page);
+
 #endif /* _ASM_CACHEFLUSH_H */
-- 
2.39.5