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authorVlastimil Babka <vbabka@suse.cz>2018-08-17 15:44:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-17 16:20:28 -0700
commit0882ff9190e3bc51e2d78c3aadd7c690eeaa91d5 (patch)
treea312187c110196abe88491dc2cb4f3228096a3c6 /arch/unicore32/mm/fault.c
parentfs/seq_file.c: simplify seq_file iteration code and interface (diff)
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mm, slub: restore the original intention of prefetch_freepointer()
In SLUB, prefetch_freepointer() is used when allocating an object from cache's freelist, to make sure the next object in the list is cache-hot, since it's probable it will be allocated soon. Commit 2482ddec670f ("mm: add SLUB free list pointer obfuscation") has unintentionally changed the prefetch in a way where the prefetch is turned to a real fetch, and only the next->next pointer is prefetched. In case there is not a stream of allocations that would benefit from prefetching, the extra real fetch might add a useless cache miss to the allocation. Restore the previous behavior. Link: http://lkml.kernel.org/r/20180809085245.22448-1-vbabka@suse.cz Fixes: 2482ddec670f ("mm: add SLUB free list pointer obfuscation") Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Kees Cook <keescook@chromium.org> Cc: Daniel Micay <danielmicay@gmail.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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