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sh: force dcache flush if dcache_dirty bit set.

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This too follows the ARM change, given that the issue at hand applies to
all platforms that implement lazy D-cache writeback.

This fixes up the case when a page mapping disappears between the
flush_dcache_page() call (when PG_dcache_dirty is set for the page) and
the update_mmu_cache() call -- such as in the case of swap cache being
freed early. This kills off the mapping test in update_mmu_cache() and
switches to simply testing for PG_dcache_dirty.

Reported-by: Nitin Gupta <ngupta@vflare.org>
Reported-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-10-13 11:18:34 +09:00
parent af67c3a9e6
commit 964f7e5a56
1 changed files with 1 additions and 1 deletions
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2
arch/sh/mm/cache.c
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@ -128,7 +128,7 @@ void __update_cache(struct vm_area_struct *vma,
return;
page = pfn_to_page(pfn);
if (pfn_valid(pfn) && page_mapping(page)) {
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);