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| author | Joonsoo Kim <iamjoonsoo.kim@lge.com> | 2014-03-12 17:26:20 +0900 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2014-03-27 14:27:34 +0200 |
| commit | 80c3a9981a544b6e96debfbcca5190b727ecd09e (patch) | |
| tree | 90e7b058d1378dfe049ae103e4e43139eed3d719 /mm/slub.c | |
| parent | 5087c8229986cc502c807a15f8ea416b0ef22346 (diff) | |
| download | lwn-80c3a9981a544b6e96debfbcca5190b727ecd09e.tar.gz lwn-80c3a9981a544b6e96debfbcca5190b727ecd09e.zip | |
slub: fix high order page allocation problem with __GFP_NOFAIL
SLUB already try to allocate high order page with clearing __GFP_NOFAIL.
But, when allocating shadow page for kmemcheck, it missed clearing
the flag. This trigger WARN_ON_ONCE() reported by Christian Casteyde.
https://bugzilla.kernel.org/show_bug.cgi?id=65991
https://lkml.org/lkml/2013/12/3/764
This patch fix this situation by using same allocation flag as original
allocation.
Reported-by: Christian Casteyde <casteyde.christian@free.fr>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/slub.c b/mm/slub.c index 7e3e0458bce4..591bf985aed0 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1350,11 +1350,12 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) page = alloc_slab_page(alloc_gfp, node, oo); if (unlikely(!page)) { oo = s->min; + alloc_gfp = flags; /* * Allocation may have failed due to fragmentation. * Try a lower order alloc if possible */ - page = alloc_slab_page(flags, node, oo); + page = alloc_slab_page(alloc_gfp, node, oo); if (page) stat(s, ORDER_FALLBACK); @@ -1364,7 +1365,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) { int pages = 1 << oo_order(oo); - kmemcheck_alloc_shadow(page, oo_order(oo), flags, node); + kmemcheck_alloc_shadow(page, oo_order(oo), alloc_gfp, node); /* * Objects from caches that have a constructor don't get |