linux-kernel - Re: oprofile + hibernation = badness

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Date:	Tue, 19 Aug 2008 09:12:31 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Andi Kleen" <ak@...ux.intel.com>
Cc:	"Pavel Machek" <pavel@...e.cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	"Robert Richter" <robert.richter@....com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Philippe Elie" <phil.el@...adoo.fr>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: oprofile + hibernation = badness

On Tue, Aug 19, 2008 at 3:13 AM, Andi Kleen <ak@...ux.intel.com> wrote:
>> ------------[ cut here ]------------
>> WARNING: at
>> /uio/arkimedes/s29/vegardno/git-working/linux-2.6/kernel/smp.c:328 s
>> mp_call_function_mask+0x194/0x1a0()
>
> The usual problem: the suspend function when interrupts are
> already disabled calls smp_call_function which is not allowed with
> interrupt off. But at this point all the other CPUs should be already
> down anyways, so it should be enough to just drop that.
>
> This patch should fix that problem at least by fixing cpu hotplug&
> suspend support. Untested.
>
> -Andi
>
>
> From 3967a8b03a30f26a6a5f41b4cc6a6772b5d0ce4f Mon Sep 17 00:00:00 2001
> From: Andi Kleen <ak@...ux.intel.com>
> Date: Tue, 19 Aug 2008 03:10:03 +0200
> Subject: [PATCH] oprofile: fix cpu hotcplug
>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

This gets rid of the suspend warnings, so it looks to be a step in the
right direction! FWIW, you may add my Tested-by to the patch.


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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