Commit 76382b5b authored Dec 24, 2009 by Markus Pietrek Committed by Paul Mundt Dec 24, 2009

sh: Ensure all PG_dcache_dirty pages are written back.



With some of the cache rework an address aliasing optimization was added,
but this managed to fail on certain mappings resulting in pages with
PG_dcache_dirty set never writing back their dcache lines. This patch
reverts to the earlier behaviour of simply always writing back when the
dirty bit is set.

Signed-off-by: Markus Pietrek <Markus.Pietrek@emtrion.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

parent 9503e891

arch/sh/mm/cache.c

+2 −6

Original line number	Diff line number	Diff line
		@@ -133,12 +133,8 @@ void __update_cache(struct vm_area_struct *vma,
		page = pfn_to_page(pfn);
		if (pfn_valid(pfn)) {
		int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
		if (dirty) {
		unsigned long addr = (unsigned long)page_address(page);

		if (pages_do_alias(addr, address & PAGE_MASK))
		__flush_purge_region((void *)addr, PAGE_SIZE);
		}
		if (dirty)
		__flush_purge_region(page_address(page), PAGE_SIZE);
		}
		}