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/mm/flush.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/flush.c')
| -rw-r--r-- | arch/arm/mm/flush.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index 87dd5ffdfa2d..b4efce9b7985 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -248,7 +248,7 @@ void flush_dcache_page(struct page *page) #ifndef CONFIG_SMP if (mapping && !mapping_mapped(mapping)) - set_bit(PG_dcache_dirty, &page->flags); + clear_bit(PG_dcache_clean, &page->flags); else #endif { @@ -257,6 +257,7 @@ void flush_dcache_page(struct page *page) __flush_dcache_aliases(mapping, page); else if (mapping) __flush_icache_all(); + set_bit(PG_dcache_clean, &page->flags); } } EXPORT_SYMBOL(flush_dcache_page); |