linux-kernel - Re: [PATCH] cgroup: minor tweak for logic to get cgroup css

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Message-ID: <20190708172944.GA24662@tower.DHCP.thefacebook.com>
Date:   Mon, 8 Jul 2019 17:29:49 +0000
From:   Roman Gushchin <guro@...com>
To:     Tejun Heo <tj@...nel.org>
CC:     Peng Wang <rocking@....edu.cn>,
        "lizefan@...wei.com" <lizefan@...wei.com>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cgroup: minor tweak for logic to get cgroup css

On Mon, Jul 08, 2019 at 09:42:43AM -0700, Tejun Heo wrote:
> On Wed, Jul 03, 2019 at 10:07:49AM +0800, Peng Wang wrote:
> > We could only handle the case that css exists
> > and css_try_get_online() fails.
> 
> As css_tryget_online() can't handle NULL input, this is a bug fix.
> Can you please clarify that in the description?

-       if (!css || !css_tryget_online(css))
+       if (css && !css_tryget_online(css))

If css == NULL, !css is true, and the second part of the || statement
will not be evaluated. So it's not a bug fix.

Thanks!