linux-kernel - Re: [PATCH] [PATCH] x86: Restore proper vector locking during cpu hotplug

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Message-ID: <489F7F1D.3030606@zytor.com>
Date:	Sun, 10 Aug 2008 16:51:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai.lu@....com>,
	Andi Kleen <ak@...e.de>, Glauber Costa <gcosta@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] [PATCH] x86:  Restore proper vector locking during cpu
 hotplug

Eric W. Biederman wrote:
> Having cpu_online_map change during assign_irq_vector can result
> in some really nasty and weird things happening.  The one that
> bit me last time was accessing non existent per cpu memory for non
> existent cpus.
> 
> This locking was removed in a sloppy x86_64 and x86_32 merge patch.
> 
> Guys can we please try and avoid subtly breaking x86 when we are
> merging files together?

Queuing for tip:x86/urgent.

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