Re: [PATCH 2/6] sched: Introduce task_is_running()

[Will Deacon]

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@xxxxxxxxxxxxx>
> ---
>  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