From: Andi Kleen <andi@firstfloor.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andi Kleen <andi@firstfloor.org>,
Steven Rostedt <rostedt@goodmis.org>,
LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
"H. Peter Anvin" <hpa@linux.intel.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
Paul Turner <pjt@google.com>
Subject: Re: Perhaps a side effect regarding NMI returns
Date: Tue, 29 Nov 2011 21:31:11 +0100 [thread overview]
Message-ID: <20111129203111.GQ24062@one.firstfloor.org> (raw)
In-Reply-To: <CA+55aFxyBYFbx=AGgJ35Dx+U8KVPktesHetYnQrYpt1QGKTrbQ@mail.gmail.com>
On Tue, Nov 29, 2011 at 12:12:44PM -0800, Linus Torvalds wrote:
> The problem is that NMI's are blocked!
>
> We're potentially switching to another process, there is no guarantee
> there will be an "iret" *anywhere* in any patch for a long time. So
> any subsequent NMI's will not be able to come in.
True. That's a bug that needs to be fixed.
As a simple fix your proposal of forcing IRET sounds good.
-Andi
next prev parent reply other threads:[~2011-11-29 20:31 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-29 4:07 Perhaps a side effect regarding NMI returns Steven Rostedt
2011-11-29 4:53 ` Linus Torvalds
2011-11-29 7:33 ` Paul Turner
2011-11-29 20:09 ` Andi Kleen
2011-11-29 20:12 ` Linus Torvalds
2011-11-29 20:31 ` Andi Kleen [this message]
2011-11-29 20:36 ` Linus Torvalds
2011-11-29 20:58 ` Steven Rostedt
2011-11-29 21:05 ` Linus Torvalds
2011-11-29 21:22 ` Steven Rostedt
2011-11-29 22:14 ` Jason Baron
2011-11-29 22:51 ` Steven Rostedt
2011-11-30 11:56 ` Peter Zijlstra
2011-11-29 20:35 ` Steven Rostedt
2011-11-29 20:44 ` Linus Torvalds
2011-12-07 16:36 ` Steven Rostedt
2011-12-07 16:44 ` Linus Torvalds
2011-12-07 17:31 ` Steven Rostedt
2011-12-07 17:48 ` Linus Torvalds
2011-12-07 17:51 ` Andi Kleen
2012-01-08 8:55 ` [tip:perf/core] x86: Do not schedule while still in NMI context tip-bot for Linus Torvalds
2011-11-29 21:28 ` Perhaps a side effect regarding NMI returns Andi Kleen
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