diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2010-09-13 16:57:36 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-09-19 13:17:43 +0200 |
| commit | c01778001a4f5ad9c62d882776235f3f31922fdd (patch) | |
| tree | a425979b236dd5c7757e9a1f0c66d3819ad99021 /arch/arm/include | |
| parent | ARM: 6378/1: Allow lazy cache flushing via PG_arch_1 for highmem pages (diff) | |
| download | linux-c01778001a4f5ad9c62d882776235f3f31922fdd.tar.xz linux-c01778001a4f5ad9c62d882776235f3f31922fdd.zip | |
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')
| -rw-r--r-- | arch/arm/include/asm/cacheflush.h | 6 | ||||
| -rw-r--r-- | arch/arm/include/asm/tlbflush.h | 2 |
2 files changed, 4 insertions, 4 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 diff --git a/arch/arm/include/asm/tlbflush.h b/arch/arm/include/asm/tlbflush.h index 33b546ae72d4..9ad329ad7458 100644 --- a/arch/arm/include/asm/tlbflush.h +++ b/arch/arm/include/asm/tlbflush.h @@ -560,7 +560,7 @@ extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); #endif /* - * if PG_dcache_dirty is set for the page, we need to ensure that any + * If PG_dcache_clean is not set for the page, we need to ensure that any * cache entries for the kernels virtual memory range are written * back to the page. */ |