linux-kernel - Re: [PATCH] sched/cputime: Mark function as __maybe

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Date:   Tue, 18 Aug 2020 11:13:10 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Alex Dewar <alex.dewar90@...il.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] sched/cputime: Mark function as __maybe_unused

On Tue, Aug 18, 2020 at 10:04 AM Alex Dewar <alex.dewar90@...il.com> wrote:
>
> Depending on config options, account_other_time() may not be called
> anywhere. Add __maybe_unused flag to fix clang warning.

Just curious, would moving this definition to be within an existing
preprocessor guard for a particular config also fix the issue? If so,
prefer that. If not, __maybe_unused is the way to go.

>
> Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
> ---
>  kernel/sched/cputime.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
> index 5a55d2300452..43ede0d6661c 100644
> --- a/kernel/sched/cputime.c
> +++ b/kernel/sched/cputime.c
> @@ -252,7 +252,7 @@ static __always_inline u64 steal_account_process_time(u64 maxtime)
>  /*
>   * Account how much elapsed time was spent in steal, irq, or softirq time.
>   */
> -static inline u64 account_other_time(u64 max)
> +static inline u64 __maybe_unused account_other_time(u64 max)
>  {
>         u64 accounted;
>
> --
> 2.28.0
>
> --
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-- 
Thanks,
~Nick Desaulniers