From: Paul Gortmaker <paul.gortmaker@windriver.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Steven Rostedt <rostedt@goodmis.org>,
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>
Subject: Re: [PATCH RT 5/8] sched: Fix affine_move_task() self-concurrency
Date: Mon, 26 Jul 2021 12:07:28 -0400 [thread overview]
Message-ID: <20210726160728.GL63045@windriver.com> (raw)
In-Reply-To: <20210725050349.GA983@bug>
[Re: [PATCH RT 5/8] sched: Fix affine_move_task() self-concurrency] On 25/07/2021 (Sun 07:03) Pavel Machek wrote:
> 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.
Maybe you missed it in the context you deleted, but this is a mainline
backport to stable-rt, and hence is not the time or place to be
injecting stylistic comments. Just like gregKH's stable tree, backports
are kept as "faithful" to the original as possible unless the older
surrounding code base forces some kind of alteration out of necessity.
Thanks,
Paul.
--
>
> > * 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:[~2021-07-26 16:26 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
2021-07-26 13:39 ` Valentin Schneider
2021-07-26 16:07 ` Paul Gortmaker [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210726160728.GL63045@windriver.com \
--to=paul.gortmaker@windriver.com \
--cc=C.Emde@osadl.org \
--cc=bigeasy@linutronix.de \
--cc=jkacur@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rt-users@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=pavel@ucw.cz \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=srivatsa@csail.mit.edu \
--cc=stable@kernel.org \
--cc=tglx@linutronix.de \
--cc=valentin.schneider@arm.com \
--cc=wagi@monom.org \
--cc=zanussi@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).