Revert "SLUB: remove useless masking of GFP_ZERO"

This reverts commit 3811dbf67162bd08412f1b0e02e554f353e93bdb.

The masking was not at all useless, and it was sensible.  We handle
GFP_ZERO in the caller, and passing it down to any page allocator logic
is buggy and wrong.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/slub.c b/mm/slub.c
index b72bc98..84ed734 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1470,6 +1470,9 @@ static void *__slab_alloc(struct kmem_cache *s,
        void **object;
        struct page *new;
 
+       /* We handle __GFP_ZERO in the caller */
+       gfpflags &= ~__GFP_ZERO;
+
        if (!c->page)
                goto new_slab;