linux-kernel - Re: Stack size protection broken on ppc64

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Message-ID: <20100208000435.GJ32246@kryten>
Date:	Mon, 8 Feb 2010 11:04:35 +1100
From:	Anton Blanchard <anton@...ba.org>
To:	Michael Neuling <mikey@...ling.org>
Cc:	stable@...nel.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, Serge Hallyn <serue@...ibm.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	Paul Mackerras <paulus@...ba.org>, benh@...nel.crashing.org,
	miltonm@....com, aeb@....nl
Subject: Re: Stack size protection broken on ppc64


Hi,

> Cool, thanks.  The following is based on this and fixes the problem for
> me on PPC64 ie. the !CONFIG_STACK_GROWSUP case. 

Thanks! Seeing the original setting of EXTRA_STACK_VM_PAGES is more or
less random, I wonder if we should round EXTRA_STACK_VM_SIZE up to 128kB
(or even down to 64kB) so it operates better with > 4kB pages.

But in the end its probably of little use for the default OVERCOMMIT_GUESS
setting, so the main thing is we dont terminate processes incorrectly.

Acked-by: Anton Blanchard <anton@...ba.org>

Anton
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