From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
paulmck <paulmck@linux.ibm.com>, Ingo Molnar <mingo@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"Russell King, ARM Linux" <linux@armlinux.org.uk>,
Chris Metcalf <cmetcalf@ezchip.com>, Chris Lameter <cl@linux.com>,
Kirill Tkhai <tkhai@yandex.ru>, Mike Galbraith <efault@gmx.de>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC PATCH 4/4] Fix: sched/membarrier: p->mm->membarrier_state racy load (v2)
Date: Fri, 13 Sep 2019 13:07:00 -0400 (EDT) [thread overview]
Message-ID: <839513130.2802.1568394420373.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <20190913160416.GA29518@redhat.com>
----- On Sep 13, 2019, at 12:04 PM, Oleg Nesterov oleg@redhat.com wrote:
> On 09/13, Mathieu Desnoyers wrote:
>>
>> membarrier_exec_mmap(), which seems to be affected by the same problem.
>
> IIRC, in the last version it is called by exec_mmap() undef task_lock(),
> so it should fine.
Fair point. Although it seems rather cleaner to use this_cpu_write() in
all 3 sites updating this variable rather than a mix of this_cpu_write
and WRITE_ONCE(), unless anyone objects.
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
prev parent reply other threads:[~2019-09-13 17:07 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-06 3:12 [RFC PATCH 0/4] Membarrier fixes/cleanups Mathieu Desnoyers
2019-09-06 3:12 ` [RFC PATCH 1/4] Fix: sched/membarrier: private expedited registration check Mathieu Desnoyers
2019-09-06 3:12 ` [RFC PATCH 2/4] Cleanup: sched/membarrier: remove redundant check Mathieu Desnoyers
2019-09-06 3:12 ` [RFC PATCH 3/4] Cleanup: sched/membarrier: only sync_core before usermode for same mm Mathieu Desnoyers
2019-09-06 7:41 ` Peter Zijlstra
2019-09-06 13:40 ` Mathieu Desnoyers
2019-09-06 3:13 ` [RFC PATCH 4/4] Fix: sched/membarrier: p->mm->membarrier_state racy load Mathieu Desnoyers
2019-09-06 8:23 ` Peter Zijlstra
2019-09-08 13:49 ` [RFC PATCH 4/4] Fix: sched/membarrier: p->mm->membarrier_state racy load (v2) Mathieu Desnoyers
2019-09-08 16:51 ` Linus Torvalds
2019-09-10 9:48 ` Mathieu Desnoyers
2019-09-12 13:48 ` Will Deacon
2019-09-12 14:24 ` Linus Torvalds
2019-09-12 15:47 ` Will Deacon
2019-09-13 14:22 ` Mathieu Desnoyers
2019-09-19 16:26 ` Will Deacon
2019-09-19 17:33 ` Mathieu Desnoyers
2019-09-09 11:00 ` Oleg Nesterov
2019-09-13 15:20 ` Mathieu Desnoyers
2019-09-13 16:04 ` Oleg Nesterov
2019-09-13 17:07 ` Mathieu Desnoyers [this message]
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