linux-kernel - Re: arm checkstack

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Message-ID: <20081104173524.GB16036@logfs.org>
Date:	Tue, 4 Nov 2008 18:35:24 +0100
From:	Jörn Engel <joern@...fs.org>
To:	Matthieu CASTET <matthieu.castet@...rot.com>
Cc:	Linux Arm Mailing List <linux-arm-kernel@...ts.arm.linux.org.uk>,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: arm checkstack

On Tue, 4 November 2008 17:06:28 +0100, Matthieu CASTET wrote:
> 
> I wonder why the arm version of checkstack only catch stack size >= 300
> and < 10000 [1].
> Why doesn't it use ".*sub.*sp, sp, #([0-9]{1,8})" to catch all stack usage ?

Looks like a bug.  And it further looks like Holger just copied what
everyone else did at the time.  And the one who started this strange
pattern was: Arnd.

Arnd, did you have a good reason for choosing the pattern?

> [1]
> $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;

Jörn

-- 
The cost of changing business rules is much more expensive for software
than for a secretaty.
-- unknown
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