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authorMatt Fleming <matt@console-pimps.org>2009-12-24 23:17:35 +0100
committerMatt Fleming <matt@console-pimps.org>2010-01-02 01:51:52 +0100
commitb4c892762373c5e59c7e8db35f5f9a7658602bda (patch)
tree865bb13abd9af7dd4727f28f4abcd4299c501321 /arch/sh/mm/cache-sh4.c
parentsh: Correct the PTRS_PER_PMD and PMD_SHIFT values (diff)
downloadlinux-b4c892762373c5e59c7e8db35f5f9a7658602bda.tar.xz
linux-b4c892762373c5e59c7e8db35f5f9a7658602bda.zip
sh: Optimise flush_dcache_page() on SH4
If the page is not mapped into any process's address space then aliases cannot exist in the cache. So reduce the amount of flushing we perform. Signed-off-by: Matt Fleming <matt@console-pimps.org>
Diffstat (limited to 'arch/sh/mm/cache-sh4.c')
-rw-r--r--arch/sh/mm/cache-sh4.c13
1 files changed, 3 insertions, 10 deletions
diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index 560ddb6bc8a7..a2301daeefa3 100644
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -109,6 +109,7 @@ static inline void flush_cache_one(unsigned long start, unsigned long phys)
static void sh4_flush_dcache_page(void *arg)
{
struct page *page = arg;
+ unsigned long addr = (unsigned long)page_address(page);
#ifndef CONFIG_SMP
struct address_space *mapping = page_mapping(page);
@@ -116,16 +117,8 @@ static void sh4_flush_dcache_page(void *arg)
set_bit(PG_dcache_dirty, &page->flags);
else
#endif
- {
- unsigned long phys = page_to_phys(page);
- unsigned long addr = CACHE_OC_ADDRESS_ARRAY;
- int i, n;
-
- /* Loop all the D-cache */
- n = boot_cpu_data.dcache.n_aliases;
- for (i = 0; i < n; i++, addr += PAGE_SIZE)
- flush_cache_one(addr, phys);
- }
+ flush_cache_one(CACHE_OC_ADDRESS_ARRAY |
+ (addr & shm_align_mask), page_to_phys(page));
wmb();
}