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authorCatalin Marinas <catalin.marinas@arm.com>2010-09-13 15:57:36 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-09-19 12:17:43 +0100
commitc01778001a4f5ad9c62d882776235f3f31922fdd (patch)
treea425979b236dd5c7757e9a1f0c66d3819ad99021 /arch/arm/include/asm/cacheflush.h
parent0fc73099dd25df2c5181b7bad57d1faa5cd12d3c (diff)
downloadblackbird-op-linux-c01778001a4f5ad9c62d882776235f3f31922fdd.tar.gz
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ARM: 6379/1: Assume new page cache pages have dirty D-cache
There are places in Linux where writes to newly allocated page cache pages happen without a subsequent call to flush_dcache_page() (several PIO drivers including USB HCD). This patch changes the meaning of PG_arch_1 to be PG_dcache_clean and always flush the D-cache for a newly mapped page in update_mmu_cache(). The patch also sets the PG_arch_1 bit in the DMA cache maintenance function to avoid additional cache flushing in update_mmu_cache(). Tested-by: Rabin Vincent <rabin.vincent@stericsson.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/cacheflush.h')
-rw-r--r--arch/arm/include/asm/cacheflush.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
index 4656a24058d2..d3730f0f4b50 100644
--- a/arch/arm/include/asm/cacheflush.h
+++ b/arch/arm/include/asm/cacheflush.h
@@ -137,10 +137,10 @@
#endif
/*
- * This flag is used to indicate that the page pointed to by a pte
- * is dirty and requires cleaning before returning it to the user.
+ * This flag is used to indicate that the page pointed to by a pte is clean
+ * and does not require cleaning before returning it to the user.
*/
-#define PG_dcache_dirty PG_arch_1
+#define PG_dcache_clean PG_arch_1
/*
* MM Cache Management
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