linux-kernel - Re: [PATCH] cgroup: Fix uninitialized variable warning

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Message-ID: <20151223213519.GM5003@mtj.duckdns.org>
Date:	Wed, 23 Dec 2015 16:35:19 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Li Zefan <lizefan@...wei.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Dave Jones <davej@...emonkey.org.uk>,
	kernel-team@...com, Aleksa Sarai <cyphar@...har.com>,
	Michal Hocko <mhocko@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH] cgroup: Fix uninitialized variable warning

Hello, Ross.

On Wed, Dec 23, 2015 at 02:30:40PM -0700, Ross Zwisler wrote:
>  static int mem_cgroup_can_attach(struct cgroup_taskset *tset)
>  {
>  	struct cgroup_subsys_state *css;
> -	struct mem_cgroup *memcg;
> +	struct mem_cgroup *memcg = NULL;

It's one thing to add spurious init to shut up gcc

> @@ -4805,7 +4805,7 @@ static int mem_cgroup_can_attach(struct cgroup_taskset *tset)
>  		p = leader;
>  		memcg = mem_cgroup_from_css(css);
>  	}
> -	if (!p)
> +	if (!p || !memcg)

and to another to add an additional processing on it.

Please note which gcc version you were using in the commit description
and mark the init with a comment.

Thanks.

-- 
tejun
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