linux-kernel - Re: [PATCH UPDATE] deflate stack usage in lib/inflate.c

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Date:	Fri, 13 Apr 2007 01:02:30 +0200
From:	Andi Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tim Yamin <plasmaroo@...too.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH UPDATE] deflate stack usage in lib/inflate.c

On Friday 13 April 2007 00:56:56 Jeremy Fitzhardinge wrote:
> Andi Kleen wrote:
> >> (This was under Xen, but there's no reason it couldn't happen on bare
> >>   hardware.)
> >>     
> >
> > Hmm, does Xen perhaps not use interrupt stacks?
> 
> Looks like that's all done in do_IRQ, so it should be independent of
> whether its Xen or not.  And the stack overflow check is performed on
> the main stack, before switching to the interrupt stack.

Yes, but then we should have seen more frequently, shouldn't we? I always
run with the stack overflow check enabled and I don't think I ever saw 
warnings in inflate.

Something must be different in the Xen setup. Dunno if it's a bug,
but such differences could cause more problems later.

-Andi



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