linux-kernel - Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask

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Message-ID: <20080820013930.GN9807@one.firstfloor.org>
Date:	Wed, 20 Aug 2008 03:39:30 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask_bitmask+0xc3/0xe0()

On Tue, Aug 19, 2008 at 09:51:44PM +0200, Vegard Nossum wrote:
> Hi,
> 
> With latest -git (1fca25427482387689fa27594c992a961d98768f), I got
> this on reading from /dev/cpu/*/* while hot-unplugging cpu1.

It's generally known the oprofile doesn't support CPU hotplug well.
Someone needs to make a project out of fixing it properly. Right now
it's just a "don't do that when it hurts"

-Andi

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