linux-kernel - Re: [PATCH 5/5] x86: Add debug of invalid per

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Message-ID: <Pine.LNX.4.64.0801181055320.30775@schroedinger.engr.sgi.com>
Date:	Fri, 18 Jan 2008 10:56:41 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	travis@....com, Andrew Morton <akpm@...ux-foundation.org>,
	mingo@...e.hu, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] x86: Add debug of invalid per_cpu map accesses

On Fri, 18 Jan 2008, Andi Kleen wrote:

> On Friday 18 January 2008 19:30:16 travis@....com wrote:
> > Provide a means to trap usages of per_cpu map variables before
> > they are setup.  Define CONFIG_DEBUG_PER_CPU_MAPS to activate.
> 
> Are you sure that debug option is generally useful enough
> to merge? It seems very specific to your patchkit, but I'm not
> sure it would be worth carrying forever in the kernel.
> 
> Better would be probably to just unmap those areas anyways.

Its generally useful also for the cpu_alloc changes that may lead 
to the moving around of early initialization code for consolidation of 
code between i386 and x86_64 once Mike's initial patchset is in.

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