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Message-ID: <20190708173137.GH657710@devbig004.ftw2.facebook.com>
Date: Mon, 8 Jul 2019 10:31:37 -0700
From: Tejun Heo <tj@...nel.org>
To: Roman Gushchin <guro@...com>
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 05:29:49PM +0000, Roman Gushchin wrote:
> 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.
Ah right, it's just confusing. Will apply after the merge window.
Thanks.
--
tejun
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