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slub: disallow changing cpu_partial from userspace for debug caches

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For caches with debugging enabled, "slub: Switch per cpu partial page
support off for debugging" changes cpu_partial to 0.  It shouldn't be
tunable from userspace for such caches, otherwise the same accounting
issues arise during validation.

This patch disallows tuning /sys/kernel/slab/cache/cpu_partial to be non-
zero for caches with debugging enabled.

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
David Rientjes 2012-01-09 13:19:45 -08:00 committed by Pekka Enberg
parent 213eeb9fd9
commit 74ee4ef1f9
1 changed files with 2 additions and 0 deletions
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mm/slub.c
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@ -4649,6 +4649,8 @@ static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf,
err = strict_strtoul(buf, 10, &objects);
if (err)
return err;
if (objects && kmem_cache_debug(s))
return -EINVAL;
s->cpu_partial = objects;
flush_all(s);