linux-kernel - Re: [RFC][PATCH 1/4] memcg: fix for mem_cgroup_get_reclaim_stat_from

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4966A117.9030201@cn.fujitsu.com>
Date:	Fri, 09 Jan 2009 08:57:59 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, balbir@...ux.vnet.ibm.com,
	menage@...gle.com
Subject: Re: [RFC][PATCH 1/4] memcg: fix for mem_cgroup_get_reclaim_stat_from_page

> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e2996b8..62e69d8 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -559,6 +559,10 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page)
>  		return NULL;
>  
>  	pc = lookup_page_cgroup(page);
> +	smp_rmb();

It is better to add a comment to explain this smp_rmb. I think it's recommended
that every memory barrier has a comment.

> +	if (!PageCgroupUsed(pc))
> +		return NULL;
> +
>  	mz = page_cgroup_zoneinfo(pc);
>  	if (!mz)
>  		return NULL;
> 
> 
--
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/