score: add flush_dcahce_page and PG_dcache_dirty define

Signed-off-by: Cui Bixiong <bixiong@sunnorth.com.cn>
Signed-off-by: Chen Liqin <liqin.chen@sunplusct.com>

	modified:   arch/score/include/asm/cacheflush.h
	modified:   arch/score/mm/cache.c

2 files changed, 27 insertions, 3 deletions

diff --git a/arch/score/include/asm/cacheflush.h b/arch/score/include/asm/cacheflush.h
index caaba24036e3..1d545d0ce206 100644
--- a/arch/score/include/asm/cacheflush.h
+++ b/arch/score/include/asm/cacheflush.h
@@ -14,10 +14,12 @@ extern void flush_cache_sigtramp(unsigned long addr);
 extern void flush_icache_all(void);
 extern void flush_icache_range(unsigned long start, unsigned long end);
 extern void flush_dcache_range(unsigned long start, unsigned long end);
+extern void flush_dcache_page(struct page *page);
+
+#define PG_dcache_dirty         PG_arch_1
 
 #define flush_cache_dup_mm(mm)                  do {} while (0)
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
-#define flush_dcache_page(page)                 do {} while (0)
 #define flush_dcache_mmap_lock(mapping)         do {} while (0)
 #define flush_dcache_mmap_unlock(mapping)       do {} while (0)
 #define flush_cache_vmap(start, end)            do {} while (0)
diff --git a/arch/score/mm/cache.c b/arch/score/mm/cache.c
index dbac9d9dfddd..b25e95743600 100644
--- a/arch/score/mm/cache.c
+++ b/arch/score/mm/cache.c
@@ -29,6 +29,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/sched.h>
+#include <linux/fs.h>
 
 #include <asm/mmu_context.h>
 
@@ -51,6 +52,27 @@ static void flush_data_cache_page(unsigned long addr)
         }
 }
 
+void flush_dcache_page(struct page *page)
+{
+        struct address_space *mapping = page_mapping(page);
+        unsigned long addr;
+
+        if (PageHighMem(page))
+                return;
+        if (mapping && !mapping_mapped(mapping)) {
+                set_bit(PG_dcache_dirty, &(page)->flags);
+                return;
+        }
+
+        /*
+         * We could delay the flush for the !page_mapping case too.  But that
+         * case is for exec env/arg pages and those are %99 certainly going to
+         * get faulted into the tlb (and thus flushed) anyways.
+         */
+        addr = (unsigned long) page_address(page);
+        flush_data_cache_page(addr);
+}
+
 /* called by update_mmu_cache. */
 void __update_cache(struct vm_area_struct *vma, unsigned long address,
                 pte_t pte)
@@ -63,11 +85,11 @@ void __update_cache(struct vm_area_struct *vma, unsigned long address,
         if (unlikely(!pfn_valid(pfn)))
                 return;
         page = pfn_to_page(pfn);
-        if (page_mapping(page) && test_bit(PG_arch_1, &page->flags)) {
+        if (page_mapping(page) && test_bit(PG_dcache_dirty, &(page)->flags)) {
                 addr = (unsigned long) page_address(page);
                 if (exec)
                         flush_data_cache_page(addr);
-                clear_bit(PG_arch_1, &page->flags);
+                clear_bit(PG_dcache_dirty, &(page)->flags);
         }
 }