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Commit b9bae340 authored by Hugh Dickins's avatar Hugh Dickins Committed by Linus Torvalds
Browse files

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: default avatarHugh 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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f1518a08

include/linux/mm.h

+4 −0
Original line number Diff line number Diff line
@@ -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;