From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp07.in.ibm.com (e28smtp07.in.ibm.com [122.248.162.7]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e28smtp07.in.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 91AEBB700E for ; Tue, 26 Jun 2012 12:49:37 +1000 (EST) Received: from /spool/local by e28smtp07.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 26 Jun 2012 08:19:31 +0530 Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay03.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q5Q2nS4H13828534 for ; Tue, 26 Jun 2012 08:19:28 +0530 Received: from d28av03.in.ibm.com (loopback [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q5Q8Ii3i020258 for ; Tue, 26 Jun 2012 18:18:45 +1000 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 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" Mime-Version: 1.0 Cc: Christoph Lameter , LKML , Pekka Enberg , linux-mm , Paul Mackerras , Matt Mackall , PowerPC email list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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/ >