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| author | Catalin Marinas <catalin.marinas@arm.com> | 2010-09-13 15:57:36 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-09-19 12:17:43 +0100 |
| commit | c01778001a4f5ad9c62d882776235f3f31922fdd (patch) | |
| tree | a425979b236dd5c7757e9a1f0c66d3819ad99021 /arch/arm/mm/copypage-v6.c | |
| parent | 0fc73099dd25df2c5181b7bad57d1faa5cd12d3c (diff) | |
| download | linux-c01778001a4f5ad9c62d882776235f3f31922fdd.tar.bz2 | |
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/mm/copypage-v6.c')
| -rw-r--r-- | arch/arm/mm/copypage-v6.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c index f55fa1044f72..bdba6c65c901 100644 --- a/arch/arm/mm/copypage-v6.c +++ b/arch/arm/mm/copypage-v6.c @@ -79,7 +79,7 @@ static void v6_copy_user_highpage_aliasing(struct page *to, unsigned int offset = CACHE_COLOUR(vaddr); unsigned long kfrom, kto; - if (test_and_clear_bit(PG_dcache_dirty, &from->flags)) + if (!test_and_set_bit(PG_dcache_clean, &from->flags)) __flush_dcache_page(page_mapping(from), from); /* FIXME: not highmem safe */ |