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Message-ID: <6c907190-f084-a6b9-ea43-9a6d3dacda05@amd.com>
Date: Wed, 29 May 2024 11:09:30 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: kunyu <kunyu@...china.com>
Cc: linux-kernel@...r.kernel.org, mingo@...hat.com, juri.lelli@...hat.com,
peterz@...radead.org, vincent.guittot@...aro.org, dietmar.eggemann@....com,
rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
bristot@...hat.com, vschneid@...hat.com
Subject: Re: [PATCH] sched: core: Remove unnecessary ‘NULL’ values from pending
Hello Kunyu,
On 5/28/2024 12:15 PM, kunyu wrote:
> pending is assigned first, so it does not need to initialize the
> assignment.
>
> Signed-off-by: kunyu <kunyu@...china.com>
> ---
> kernel/sched/core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index bcf2c4cc0522..e32fea8f5830 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -2969,7 +2969,7 @@ static int affine_move_task(struct rq *rq, struct task_struct *p, struct rq_flag
> __releases(rq->lock)
> __releases(p->pi_lock)
> {
> - struct set_affinity_pending my_pending = { }, *pending = NULL;
> + struct set_affinity_pending my_pending = { }, *pending;
Can "pending" here be initialized to "p->migration_pending" and later
be changed to the updated value of "p->migration_pending" for the
SCA_MIGRATE_ENABLE case?
if (!(flags & SCA_MIGRATE_ENABLE)) {
/* serialized by p->pi_lock */
if (!p->migration_pending) {
...
/* Update pending to new value of p->migration_pending */
pending = p->migration_pending = &my_pending;
} else {
...
}
}
--
Rest of the initial assignments to "pending" can be dropped then.
Thoughts?
> bool stop_pending, complete = false;
>
> /* Can the task run on the task's current CPU? If so, we're done */
--
Thanks and Regards,
Prateek
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