From: Pavel Machek <pavel@ucw.cz>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
John Kacur <jkacur@redhat.com>, Daniel Wagner <wagi@monom.org>,
Tom Zanussi <zanussi@kernel.org>,
"Srivatsa S. Bhat" <srivatsa@csail.mit.edu>,
stable@kernel.org,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Valentin Schneider <valentin.schneider@arm.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>
Subject: Re: [PATCH RT 5/8] sched: Fix affine_move_task() self-concurrency
Date: Sun, 25 Jul 2021 07:03:49 +0200 [thread overview]
Message-ID: <20210725050349.GA983@bug> (raw)
In-Reply-To: <20210709220018.003428207@goodmis.org>
Hi!
> 5.10.47-rt46-rc1 stable review patch.
> If anyone has any objections, please let me know.
>
> Add set_affinity_pending::stop_pending, to indicate if a stopper is in
> progress.
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 9cbe12d8c5bd..20588a59300d 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1900,6 +1900,7 @@ struct migration_arg {
>
> struct set_affinity_pending {
> refcount_t refs;
> + unsigned int stop_pending;
> struct completion done;
> struct cpu_stop_work stop_work;
> struct migration_arg arg;
For better readability, this should be bool, AFAICT.
> * and have the stopper function handle it all race-free.
> */
> + stop_pending = pending->stop_pending;
> + if (!stop_pending)
> + pending->stop_pending = true;
>
...because it is used as bool.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2021-07-25 5:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-09 21:59 [PATCH RT 0/8] Linux 5.10.47-rt46-rc1 Steven Rostedt
2021-07-09 21:59 ` [PATCH RT 1/8] sched: Fix migration_cpu_stop() requeueing Steven Rostedt
2021-07-09 21:59 ` [PATCH RT 2/8] sched: Simplify migration_cpu_stop() Steven Rostedt
2021-07-09 21:59 ` [PATCH RT 3/8] sched: Collate affine_move_task() stoppers Steven Rostedt
2021-07-09 21:59 ` [PATCH RT 4/8] sched: Optimize migration_cpu_stop() Steven Rostedt
2021-07-09 21:59 ` [PATCH RT 5/8] sched: Fix affine_move_task() self-concurrency Steven Rostedt
2021-07-25 5:03 ` Pavel Machek [this message]
2021-07-26 13:39 ` Valentin Schneider
2021-07-26 16:07 ` Paul Gortmaker
2021-07-09 21:59 ` [PATCH RT 6/8] sched: Simplify set_affinity_pending refcounts Steven Rostedt
2021-07-09 22:00 ` [PATCH RT 7/8] sched: Dont defer CPU pick to migration_cpu_stop() Steven Rostedt
2021-07-09 22:00 ` [PATCH RT 8/8] Linux 5.10.47-rt46-rc1 Steven Rostedt
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