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Message-ID: <alpine.DEB.2.00.1201091316390.10232@chino.kir.corp.google.com> Date: Mon, 9 Jan 2012 13:19:45 -0800 (PST) From: David Rientjes <rientjes@...gle.com> To: Pekka Enberg <penberg@...nel.org> cc: Christoph Lameter <cl@...ux.com>, Eric Dumazet <eric.dumazet@...il.com>, linux-kernel@...r.kernel.org Subject: [patch slab/urgent] disallow changing cpu_partial from userspace for debug caches 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. Signed-off-by: David Rientjes <rientjes@...gle.com> --- mm/slub.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/mm/slub.c b/mm/slub.c --- a/mm/slub.c +++ b/mm/slub.c @@ -4639,6 +4639,8 @@ 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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