Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit b4c89276 authored by Matt Fleming's avatar Matt Fleming
Browse files

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: default avatarMatt Fleming <matt@console-pimps.org>
parent 3f5ab768
Loading
Loading
Loading
Loading
+3 −10
Original line number Diff line number Diff line
@@ -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();
}