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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 <[email protected]> Cc: Nicolas Ferre <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>