From: Tejun Heo <tj@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: torvalds@linux-foundation.org, mingo@redhat.com,
akpm@linux-foundation.org, tglx@linutronix.de,
peterz@infradead.org
Subject: Re: [PATCHSET] timer: clean up initializers and implement irqsafe timers
Date: Mon, 13 Aug 2012 16:35:20 -0700 [thread overview]
Message-ID: <20120813233520.GG25632@google.com> (raw)
In-Reply-To: <1344449428-24962-1-git-send-email-tj@kernel.org>
Hello,
On Wed, Aug 08, 2012 at 11:10:24AM -0700, Tejun Heo wrote:
> Timer internals are protected by irqsafe lock but the lock is
> naturally dropped and irq enabled while a timer is executed. This
> makes dequeueing timer for execution and the actual execution
> non-atomic against IRQs. No matter what the timer function does, IRQs
> can occur between timer dispatch and execution. This means that an
> IRQ handler could interrupt any timer in progress and it's impossible
> for an IRQ handler to cancel and drain a timer.
If nobody objects, I'll route this through wq/for-3.7 together with
"workqueue: use irqsafe timer in delayed_work" patchset. If you
object, please scream.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-08-13 23:35 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-08 18:10 Tejun Heo
2012-08-08 18:10 ` [PATCH 1/4] timer: generalize timer->base flags handling Tejun Heo
2012-08-21 16:40 ` [tip:timers/core] timer: Generalize " tip-bot for Tejun Heo
2012-08-08 18:10 ` [PATCH 2/4] timer: relocate declarations of init_timer_on_stack_key() Tejun Heo
2012-08-21 16:41 ` [tip:timers/core] timer: Relocate " tip-bot for Tejun Heo
2012-08-08 18:10 ` [PATCH 3/4] timer: clean up timer initializers Tejun Heo
2012-08-21 16:42 ` [tip:timers/core] timer: Clean " tip-bot for Tejun Heo
2012-08-08 18:10 ` [PATCH 4/4] timer: implement TIMER_IRQSAFE Tejun Heo
2012-08-21 16:43 ` [tip:timers/core] timer: Implement TIMER_IRQSAFE tip-bot for Tejun Heo
2012-08-21 19:26 ` Tejun Heo
2012-08-08 18:13 ` $SUBJ should have been "[PATCHSET] timer: clean up initializers and implement irqsafe timers" Tejun Heo
2012-08-13 23:35 ` Tejun Heo [this message]
2012-08-14 8:32 ` [PATCHSET] timer: clean up initializers and implement irqsafe timers Thomas Gleixner
2012-08-14 19:16 ` Thomas Gleixner
2012-08-14 19:22 ` Tejun Heo
2012-08-14 21:03 ` Thomas Gleixner
2012-08-14 21:56 ` Tejun Heo
2012-08-14 22:45 ` Thomas Gleixner
2012-08-14 23:01 ` Tejun Heo
2012-08-14 23:33 ` Thomas Gleixner
2012-08-15 0:18 ` Tejun Heo
2012-08-15 10:58 ` Peter Zijlstra
2012-08-16 19:36 ` Tejun Heo
2012-08-14 18:55 ` Thomas Gleixner
2012-08-14 19:15 ` Tejun Heo
2012-08-14 20:43 ` Thomas Gleixner
2012-08-14 21:40 ` Tejun Heo
2012-08-14 23:12 ` Thomas Gleixner
2012-08-14 23:27 ` Tejun Heo
2012-08-14 23:46 ` Thomas Gleixner
2012-08-14 23:52 ` Tejun Heo
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