From c01778001a4f5ad9c62d882776235f3f31922fdd Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Mon, 13 Sep 2010 15:57:36 +0100 Subject: 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 Cc: Nicolas Pitre Signed-off-by: Catalin Marinas Signed-off-by: Russell King --- arch/arm/mm/copypage-v6.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm/mm/copypage-v6.c') 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 */ -- cgit v1.2.3