linux-kernel - Re: [PATCH v6 2/3] CPU hotplug, stop-machine: Plug race-window that leads to "IPI-to-offline-CPU"

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Message-ID: <20140523152145.GF30445@twins.programming.kicks-ass.net>
Date:	Fri, 23 May 2014 17:21:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	tglx@...utronix.de, mingo@...nel.org, tj@...nel.org,
	rusty@...tcorp.com.au, akpm@...ux-foundation.org,
	fweisbec@...il.com, hch@...radead.org, mgorman@...e.de,
	riel@...hat.com, bp@...e.de, rostedt@...dmis.org,
	mgalbraith@...e.de, ego@...ux.vnet.ibm.com,
	paulmck@...ux.vnet.ibm.com, oleg@...hat.com, rjw@...ysocki.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/3] CPU hotplug, stop-machine: Plug race-window that
 leads to "IPI-to-offline-CPU"

On Fri, May 23, 2014 at 03:42:20PM +0530, Srivatsa S. Bhat wrote:
>        Re-enable interrupts                          Re-enable interrupts
> 
>                                                      The pending IPI is noted
>                                                      immediately, but alas,
>                                                      the CPU is offline at
>                                                      this point.
> 

So wasn't clear_local_APIC() (and the arch function __cpu_disable() in
general) wipe all pending interrup state?

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