From: Andi Kleen <andi@firstfloor.org>
To: Haicheng Li <haicheng.li@linux.intel.com>
Cc: linux-mm@kvack.org, Christoph Lameter <cl@linux-foundation.org>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Matt Mackall <mpm@selenic.com>,
linux-kernel@vger.kernel.org, stable@kernel.org
Subject: Re: [PATCH] slab: initialize unused alien cache entry as NULL at alloc_alien_cache().
Date: Tue, 22 Dec 2009 13:40:34 +0100 [thread overview]
Message-ID: <87skb3chbx.fsf@basil.nowhere.org> (raw)
In-Reply-To: <4B30BDA8.1070904@linux.intel.com> (Haicheng Li's message of "Tue, 22 Dec 2009 20:38:00 +0800")
Haicheng Li <haicheng.li@linux.intel.com> writes:
> Memory hotplug would online new node in runtime, then reap timer will
> add this new node as a reap node. In such case, for each existing
> kmem_list, we need to ensure that the alien cache entry corresponding
> to this new added node is NULL. Otherwise, it might cause BUG when
> reap_alien() affecting the new added node.
>
> Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
IMHO a 2.6.33 and even stable candidate
-Andi
> ---
> mm/slab.c | 7 +++----
> 1 files changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/mm/slab.c b/mm/slab.c
> index 7dfa481..a9486a0 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -966,18 +966,17 @@ static void *alternate_node_alloc(struct kmem_cache *, gfp_t);
> static struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp)
> {
> struct array_cache **ac_ptr;
> - int memsize = sizeof(void *) * nr_node_ids;
> + int memsize = sizeof(void *) * MAX_NUMNODES;
> int i;
>
> if (limit > 1)
> limit = 12;
> ac_ptr = kmalloc_node(memsize, gfp, node);
> if (ac_ptr) {
> + memset(ac_ptr, 0, memsize);
> for_each_node(i) {
> - if (i == node || !node_online(i)) {
> - ac_ptr[i] = NULL;
> + if (i == node || !node_online(i))
> continue;
> - }
> ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp);
> if (!ac_ptr[i]) {
> for (i--; i >= 0; i--)
> --
> 1.6.0.rc1
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-12-22 12:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-22 12:38 [PATCH] slab: initialize unused alien cache entry as NULL at alloc_alien_cache() Haicheng Li
2009-12-22 12:40 ` Andi Kleen [this message]
2009-12-22 15:47 ` Christoph Lameter
2009-12-23 6:52 ` Haicheng Li
2009-12-23 10:10 ` Eric Dumazet
2009-12-23 10:23 ` Andi Kleen
2009-12-23 11:23 ` Haicheng Li
2010-01-04 17:26 ` Christoph Lameter
2009-12-22 22:38 ` Matt Mackall
2009-12-23 9:58 ` [PATCH v2] " Haicheng Li
2010-01-04 17:27 ` Christoph Lameter
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