sh: force dcache flush if dcache_dirty bit set.
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>
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@ -128,7 +128,7 @@ void __update_cache(struct vm_area_struct *vma,
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return;
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page = pfn_to_page(pfn);
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if (pfn_valid(pfn) && page_mapping(page)) {
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if (pfn_valid(pfn)) {
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int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
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if (dirty) {
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unsigned long addr = (unsigned long)page_address(page);
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