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authorMatthew Wilcox <mawilcox@microsoft.com>2018-06-07 17:05:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-07 17:34:34 -0700
commit128227e7fe4087b60f1bd31f762e61237eb23790 (patch)
treeccf03475b150751d98f4f901339a3871dafe8240 /mm/slob.c
parente56ee574bc46b9734066008b3dc105bd7d4cbc0c (diff)
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slab: __GFP_ZERO is incompatible with a constructor
__GFP_ZERO requests that the object be initialised to all-zeroes, while the purpose of a constructor is to initialise an object to a particular pattern. We cannot do both. Add a warning to catch any users who mistakenly pass a __GFP_ZERO flag when allocating a slab with a constructor. Link: http://lkml.kernel.org/r/20180412191322.GA21205@bombadil.infradead.org Fixes: d07dbea46405 ("Slab allocators: support __GFP_ZERO in all allocators") Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slob.c')
-rw-r--r--mm/slob.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/slob.c b/mm/slob.c
index 623e8a5c46ce..307c2c9feb44 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -555,8 +555,10 @@ static void *slob_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
flags, node);
}
- if (b && c->ctor)
+ if (b && c->ctor) {
+ WARN_ON_ONCE(flags & __GFP_ZERO);
c->ctor(b);
+ }
kmemleak_alloc_recursive(b, c->size, 1, c->flags, flags);
return b;