csky: Enable defer flush_dcache_page for abiv2 cpus (807/810/860)

[linux-2.6-microblaze.git] / arch / csky / abiv2 / inc / abi / cacheflush.h

diff --git a/arch/csky/abiv2/inc/abi/cacheflush.h b/arch/csky/abiv2/inc/abi/cacheflush.h
index 62a9031..acd7c6c 100644 (file)
--- a/arch/csky/abiv2/inc/abi/cacheflush.h
+++ b/arch/csky/abiv2/inc/abi/cacheflush.h
@@ -15,8 +15,16 @@
 #define flush_cache_dup_mm(mm)                 do { } while (0)
 #define flush_cache_range(vma, start, end)     do { } while (0)
 #define flush_cache_page(vma, vmaddr, pfn)     do { } while (0)
-#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
-#define flush_dcache_page(page)                        do { } while (0)
+
+#define PG_dcache_clean                PG_arch_1
+
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
+static inline void flush_dcache_page(struct page *page)
+{
+       if (test_bit(PG_dcache_clean, &page->flags))
+               clear_bit(PG_dcache_clean, &page->flags);
+}
+
 #define flush_dcache_mmap_lock(mapping)                do { } while (0)
 #define flush_dcache_mmap_unlock(mapping)      do { } while (0)
 #define flush_icache_page(vma, page)           do { } while (0)