netdev - Re: [PATCH 2/6] sched: Introduce task_is

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Message-ID: <20210602145921.GB31179@willie-the-truck>
Date:   Wed, 2 Jun 2021 15:59:21 +0100
From:   Will Deacon <will@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
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        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
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Subject: Re: [PATCH 2/6] sched: Introduce task_is_running()

On Wed, Jun 02, 2021 at 03:12:27PM +0200, Peter Zijlstra wrote:
> Replace a bunch of 'p->state == TASK_RUNNING' with a new helper:
> task_is_running(p).
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/x86/kernel/process.c |    4 ++--
>  block/blk-mq.c            |    2 +-
>  include/linux/sched.h     |    2 ++
>  kernel/locking/lockdep.c  |    2 +-
>  kernel/rcu/tree_plugin.h  |    2 +-
>  kernel/sched/core.c       |    6 +++---
>  kernel/sched/stats.h      |    2 +-
>  kernel/signal.c           |    2 +-
>  kernel/softirq.c          |    3 +--
>  mm/compaction.c           |    2 +-
>  10 files changed, 14 insertions(+), 13 deletions(-)
> 
> --- a/arch/x86/kernel/process.c
> +++ b/arch/x86/kernel/process.c
> @@ -931,7 +931,7 @@ unsigned long get_wchan(struct task_stru
>  	unsigned long start, bottom, top, sp, fp, ip, ret = 0;
>  	int count = 0;
>  
> -	if (p == current || p->state == TASK_RUNNING)
> +	if (p == current || task_is_running(p))

Looks like this one in get_wchan() has been cargo-culted across most of
arch/ so they'll need fixing up before you rename the struct member.

There's also a weird one in tools/bpf/runqslower/runqslower.bpf.c (!)

Will