linux-kernel - Re: [PATCH v2 1/2] blk-cgroup: Correctly free percpu iostat

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Message-ID: <YpemfZkI2G88qdQF@slm.duckdns.org>
Date:   Wed, 1 Jun 2022 07:48:45 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
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 v2 1/2] blk-cgroup: Correctly free percpu iostat_cpu in
 blkg on error exit

On Wed, Jun 01, 2022 at 12:53:23PM -0400, Waiman Long wrote:
> Commit f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup
> rstat") changes block cgroup IO stats to use the rstat APIs. It added
> a new percpu iostat_cpu field into blkg. The blkg_alloc() was modified
> to allocate the new percpu iostat_cpu but didn't free it when an error
> happened. Fix this by freeing the percpu iostat_cpu on error exit.
> 
> Fixes: f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat")
> Signed-off-by: Waiman Long <longman@...hat.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun