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authorHugh Dickins <hugh@veritas.com>2007-06-21 22:27:45 (GMT)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-21 22:55:12 (GMT)
commitb9bae3402572dc50a1e084c5b1ae5117918ef0f0 (patch)
treeb351181fffd09e06c0b3f185a0571cdb2860e870 /include
parentf1518a088bde6aea49e7c472ed6ab96178fcba3e (diff)
page_mapping must avoid slub pages
Nicolas Ferre reports oops from flush_dcache_page() on ARM when using SLUB: which reuses page->mapping as page->slab. The page_mapping() function, used by ARM and PA-RISC flush_dcache_page() implementations, must not confuse SLUB pages with those which have page->mapping set. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Nicolas Ferre <nicolas.ferre@rfo.atmel.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index e4183c6..1c12074 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -603,6 +603,10 @@ static inline struct address_space *page_mapping(struct page *page)
if (unlikely(PageSwapCache(page)))
mapping = &swapper_space;
+#ifdef CONFIG_SLUB
+ else if (unlikely(PageSlab(page)))
+ mapping = NULL;
+#endif
else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
mapping = NULL;
return mapping;

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