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sh: Optimise flush_dcache_page() on SH4

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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>
This commit is contained in:
Matt Fleming 2009-12-24 22:17:35 +00:00
parent 3f5ab76816
commit b4c8927623
1 changed files with 3 additions and 10 deletions
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13
arch/sh/mm/cache-sh4.c
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@ -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();
}