From: "Paul E. McKenney" <paulmck@kernel.org>
To: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Sven Schnelle <svens@linux.ibm.com>,
Linux Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [PATCH] s390: allow reschedule on syscall restart
Date: Thu, 21 Jan 2021 13:43:58 -0800 [thread overview]
Message-ID: <20210121214358.GX2743@paulmck-ThinkPad-P72> (raw)
In-Reply-To: <20210122083249.60d29c33@canb.auug.org.au>
On Fri, Jan 22, 2021 at 08:32:49AM +1100, Stephen Rothwell wrote:
> Hi all,
>
> On Thu, 21 Jan 2021 15:39:26 +0100 Sven Schnelle <svens@linux.ibm.com> wrote:
> >
> > Commit 845f44e8ef28 ("sched: Report local wake up on resched blind zone
> > within idle loop") from next-20210121 causes a warning because s390
> > doesn't call sched_resched_local_allow() when restarting a syscall.
> >
> > Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
> > ---
> > arch/s390/kernel/syscall.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/s390/kernel/syscall.c b/arch/s390/kernel/syscall.c
> > index bc8e650e377d..2b39ac40f970 100644
> > --- a/arch/s390/kernel/syscall.c
> > +++ b/arch/s390/kernel/syscall.c
> > @@ -162,6 +162,7 @@ void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
> > do_syscall(regs);
> > if (!test_pt_regs_flag(regs, PIF_SYSCALL_RESTART))
> > break;
> > + sched_resched_local_allow();
> > local_irq_enable();
> > }
> > exit_to_user_mode();
>
> I add that today as a merge fixup patch to the merge of the rcu tree
> (which contains commit 845f44e8ef28 ("sched: Report local wake up on
> resched blind zone within idle loop") ).
If Frederic has no objections, I will fold this in with attribution.
Either way, good catch!
Thanx, Paul
next prev parent reply other threads:[~2021-01-21 21:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-21 14:39 Warning with next-20210121 on s390 Sven Schnelle
2021-01-21 14:39 ` [PATCH] s390: allow reschedule on syscall restart Sven Schnelle
2021-01-21 21:32 ` Stephen Rothwell
2021-01-21 21:43 ` Paul E. McKenney [this message]
2021-01-21 22:31 ` Stephen Rothwell
2021-01-26 6:59 ` Christian Borntraeger
2021-01-26 9:39 ` Sven Schnelle
2021-01-26 10:25 ` Stephen Rothwell
2021-01-26 15:12 ` Paul E. McKenney
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