diff options
author | Matt Fleming <matt@console-pimps.org> | 2009-12-24 22:17:35 +0000 |
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committer | Matt Fleming <matt@console-pimps.org> | 2010-01-02 00:51:52 +0000 |
commit | b4c892762373c5e59c7e8db35f5f9a7658602bda (patch) | |
tree | 865bb13abd9af7dd4727f28f4abcd4299c501321 /arch/sh/mm/cache-sh4.c | |
parent | 3f5ab768164df9a44721660b96e0accb92eb2c24 (diff) | |
download | linux-b4c892762373c5e59c7e8db35f5f9a7658602bda.tar.bz2 |
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.c | 13 |
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(); } |