linux-kernel - Re: [PATCH v5 2/3] blk-cgroup: Return -ENOMEM directly in blkcg_css

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Message-ID: <6674e652-b083-2859-3cba-9eca6c721fba@redhat.com>
Date:   Thu, 2 Jun 2022 13:17:18 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ming Lei <ming.lei@...hat.com>
Subject: Re: [PATCH v5 2/3] blk-cgroup: Return -ENOMEM directly in
 blkcg_css_alloc() error path

On 6/2/22 12:16, Tejun Heo wrote:
> On Thu, Jun 02, 2022 at 09:35:42AM -0400, Waiman Long wrote:
>> For blkcg_css_alloc(), the only error that will be returned is -ENOMEM.
>> Simplify error handling code by returning this error directly instead
>> of setting an intermediate "ret" variable.
>>
>> Signed-off-by: Waiman Long <longman@...hat.com>
> Acked-by: Tejun Heo <tj@...nel.org>
>
> But I don't understand why this would trigger warning. Can you please
> elaborate why this is needed.
>
> Thanks.

I forgot to set "ret" in my original patch 2 in case of allocation 
error. I didn't got a warning in my own build, maybe I didn't explicitly 
enable more warning. I could have modified the patch to set "ret" on 
error, but the "ret" setting looks duplicative to me and so I added this 
patch to get rid of it.

Thanks,
Longman