Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756228Ab2FZCtf (ORCPT ); Mon, 25 Jun 2012 22:49:35 -0400 Received: from e28smtp02.in.ibm.com ([122.248.162.2]:50395 "EHLO e28smtp02.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755718Ab2FZCtd (ORCPT ); Mon, 25 Jun 2012 22:49:33 -0400 Message-ID: <1340678964.16381.20.camel@ThinkPad-T420> Subject: Re: [PATCH SLUB 1/2] duplicate the cache name in saved_alias list From: Li Zhong To: gaowanlong@cn.fujitsu.com Cc: LKML , Christoph Lameter , Pekka Enberg , Matt Mackall , Benjamin Herrenschmidt , Paul Mackerras , linux-mm , PowerPC email list Date: Tue, 26 Jun 2012 10:49:24 +0800 In-Reply-To: <4FE84352.8090303@cn.fujitsu.com> References: <1340617984.13778.37.camel@ThinkPad-T420> <4FE84352.8090303@cn.fujitsu.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 x-cbid: 12062602-5816-0000-0000-0000034F53D3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2063 Lines: 69 On Mon, 2012-06-25 at 18:54 +0800, Wanlong Gao wrote: > On 06/25/2012 05:53 PM, Li Zhong wrote: > > SLUB duplicates the cache name in kmem_cache_create(). However if the > > cache could be merged to others during early booting, the name pointer > > is saved in saved_alias list, and the string needs to be kept valid > > before slab_sysfs_init() is called. > > > > This patch tries to duplicate the cache name in saved_alias list, so > > that the cache name could be safely kfreed after calling > > kmem_cache_create(), if that name is kmalloced. > > > > Signed-off-by: Li Zhong > > --- > > mm/slub.c | 6 ++++++ > > 1 files changed, 6 insertions(+), 0 deletions(-) > > > > diff --git a/mm/slub.c b/mm/slub.c > > index 8c691fa..3dc8ed5 100644 > > --- a/mm/slub.c > > +++ b/mm/slub.c > > @@ -5373,6 +5373,11 @@ static int sysfs_slab_alias(struct kmem_cache *s, > > const char *name) > > > > al->s = s; > > al->name = name; > > + al->name = kstrdup(name, GFP_KERNEL); > > dup assigned the al->name ? > Ah, yes, there should be a '-' before the line al->name = name; Thank you, I will update it. > Thanks, > Wanlong Gao > > > + if (!al->name) { > > + kfree(al); > > + return -ENOMEM; > > + } > > al->next = alias_list; > > alias_list = al; > > return 0; > > @@ -5409,6 +5414,7 @@ static int __init slab_sysfs_init(void) > > if (err) > > printk(KERN_ERR "SLUB: Unable to add boot slab alias" > > " %s to sysfs\n", s->name); > > + kfree(al->name); > > kfree(al); > > } > > > > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/