linux-kernel - Re: [PATCH] cgroup: remove incorrect check on the return value of css

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Message-id: <352F18C3-8039-4636-84EB-58FE457CA455@me.com>
Date:   Tue, 23 Jan 2018 07:21:36 +0800
From:   Xiongwei Song <sxwjean@...com>
To:     Tejun Heo <tj@...nel.org>
Cc:     guro@...com, longman@...hat.com, davem@...emloft.net,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        sxwjean@...il.com
Subject: Re: [PATCH] cgroup: remove incorrect check on the return value of
 css_alloc


> On 22 Jan 2018, at 11:55 PM, Tejun Heo <tj@...nel.org> wrote:
> 
> Hello,
> 
> On Mon, Jan 22, 2018 at 09:38:51PM +0800, Xiongwei Song wrote:
>> The function css_alloc never return NULL, it may return normal pointer or
> 
> It's a calling a controller implemented method.  I'd much rather keep
> the extra protection.
> 
>> error codes that made by ERR_PTR, so !css is always false, we need use
>> IS_ERR to check it, and if this is true, we should use ERR_CAST handle it.
> 
> It's of the same type.  Why would it need casting?

Okay, Thanks for your comment.

Apologies for the noise.

Thanks
Xiongwei
> 
> Thanks.
> 
> -- 
> tejun