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

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Message-ID: <YgK6k4TXnRbm02dh@slm.duckdns.org>
Date:   Tue, 8 Feb 2022 08:46:43 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Namhyung Kim <namhyung@...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>,
        "Paul E. McKenney" <paul.mckenney@...aro.org>,
        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
Subject: Re: [PATCH 02/12] cgroup: rstat: Make cgroup_rstat_cpu_lock name
 readable

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>

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

Thanks.

-- 
tejun