From cb097cd48313575b03a5de092a04f6af8aa0739e Mon Sep 17 00:00:00 2001
From: Shakeel Butt <shakeelb@google.com>
Date: Thu, 11 Jul 2019 20:53:36 -0700
Subject: [PATCH] slub: don't panic for memcg kmem cache creation failure
Currently for CONFIG_SLUB, if a memcg kmem cache creation is failed and
the corresponding root kmem cache has SLAB_PANIC flag, the kernel will
be crashed. This is unnecessary as the kernel can handle the creation
failures of memcg kmem caches. Additionally CONFIG_SLAB does not
implement this behavior. So, to keep the behavior consistent between
SLAB and SLUB, removing the panic for memcg kmem cache creation
failures. The root kmem cache creation failure for SLAB_PANIC correctly
panics for both SLAB and SLUB.
Link: http://lkml.kernel.org/r/20190619232514.58994-1-shakeelb@google.com
Reported-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Pekka Enberg <penberg@kernel.org>
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>
---
mm/slub.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index 1802c87799ffc..d46a91759b96e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3650,10 +3650,6 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags)
free_kmem_cache_nodes(s);
error:
- if (flags & SLAB_PANIC)
- panic("Cannot create slab %s size=%u realsize=%u order=%u offset=%u flags=%lx\n",
- s->name, s->size, s->size,
- oo_order(s->oo), s->offset, (unsigned long)flags);
return -EINVAL;
}
--
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