linux-kernel - Re: [PATCH 02/12] cgroup: rstat: Make cgroup_rstat_cpu

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Date:   Tue, 8 Feb 2022 11:16:46 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Byungchul Park <byungchul.park@....com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Radoslaw Burny <rburny@...gle.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
        paulmck@...nel.org
Subject: Re: [PATCH 02/12] cgroup: rstat: Make cgroup_rstat_cpu_lock name readable

Hi Tejun,

On Tue, Feb 8, 2022 at 10:46 AM Tejun Heo <tj@...nel.org> wrote:
>
> On Tue, Feb 08, 2022 at 10:41:58AM -0800, Namhyung Kim wrote:
> > The raw_spin_lock_init() uses the argument to name its lockdep map.
> > But passing per_cpu_ptr() macro directly makes it a very very long
> > name as it expanded like below:
> >
> >   ({ do { const void *__vpp_verify = (typeof((&cgroup_rstat_cpu_lock) ...
> >
> > Let's fix it by passing a local variable instead.  With this change,
> > the name now looks like:
> >
> >   cgrp_rstat_cpu_lock
> >
> > Cc: Tejun Heo <tj@...nel.org>
> > Cc: Zefan Li <lizefan.x@...edance.com>
> > Cc: Johannes Weiner <hannes@...xchg.org>
> > Cc: cgroups@...r.kernel.org
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>
> Acked-by: Tejun Heo <tj@...nel.org>

Thanks!

>
> but maybe add a comment explaining what's going on?

Sure, I'll add the comment.