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| 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/mm/fault-armv.c | |
| 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/mm/fault-armv.c')
| -rw-r--r-- | arch/arm/mm/fault-armv.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c index 9b906dec1ca1..58846cbd0e0b 100644 --- a/arch/arm/mm/fault-armv.c +++ b/arch/arm/mm/fault-armv.c @@ -141,7 +141,7 @@ make_coherent(struct address_space *mapping, struct vm_area_struct *vma, * a page table, or changing an existing PTE. Basically, there are two * things that we need to take care of: * - * 1. If PG_dcache_dirty is set for the page, we need to ensure + * 1. 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. * 2. If we have multiple shared mappings of the same space in @@ -169,7 +169,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, mapping = page_mapping(page); #ifndef CONFIG_SMP - if (test_and_clear_bit(PG_dcache_dirty, &page->flags)) + if (!test_and_set_bit(PG_dcache_clean, &page->flags)) __flush_dcache_page(mapping, page); #endif if (mapping) { |