From: Peter Zijlstra <peterz@infradead.org>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Huang Ying <ying.huang@intel.com>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: x86: Inconsistent xAPIC synchronization in arch_irq_work_raise?
Date: Thu, 23 Jan 2014 20:11:40 +0100 [thread overview]
Message-ID: <20140123191140.GV11314@laptop.programming.kicks-ass.net> (raw)
In-Reply-To: <52E164BC.1080302@siemens.com>
On Thu, Jan 23, 2014 at 07:51:40PM +0100, Jan Kiszka wrote:
> Next we have x86's arch_irq_work_raise which does wait-write-wait,
> either by chance or in order to work around a missing atomicity of
> wait+write somewhere else. Preemption is off, interrupts remain on.
Note that arch_irq_work_raise() is 'special' in that its used from NMI
context, so no amount of interrupts disabling will serialize things.
next prev parent reply other threads:[~2014-01-23 19:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-21 13:02 x86: Inconsistent xAPIC synchronization in arch_irq_work_raise? Jan Kiszka
2014-01-21 14:01 ` Peter Zijlstra
2014-01-21 14:10 ` Ingo Molnar
2014-01-21 14:11 ` Jan Kiszka
2014-01-21 14:34 ` Jan Kiszka
2014-01-21 14:51 ` Peter Zijlstra
2014-01-21 23:20 ` Huang Ying
2014-01-22 18:43 ` Andi Kleen
2014-01-23 18:51 ` Jan Kiszka
2014-01-23 19:11 ` Peter Zijlstra [this message]
2014-01-23 19:22 ` Andi Kleen
2014-01-23 19:51 ` Jan Kiszka
2014-01-23 20:17 ` Andi Kleen
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