linux-kernel - Re: [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86

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Message-ID: <20080325180700.GY2170@one.firstfloor.org>
Date:	Tue, 25 Mar 2008 19:07:00 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, viro@....linux.org.uk
Subject: Re: [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86

On Tue, Mar 25, 2008 at 10:55:06AM -0700, Christoph Lameter wrote:
> On Tue, 25 Mar 2008, Andi Kleen wrote:
> 
> > Maybe sparse could be taught to check for this if it happens
> > in a single function? (cc'ing Al who might have some thoughts
> > on this). Of course if it happens spread out over multiple
> > functions sparse wouldn't help neither. 
> 
> We could add debugging code to virt_to_page (or __pa) to catch these uses.

Hard to test all cases. Static checking would be better.

Or just not do it? I didn't think order 1 failures were that big a problem.


-Andi
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