linux-kernel - Re: [PATCH] Fix max-stack calculators to skip canary

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Date:	Tue, 22 Apr 2008 13:09:17 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Joe Perches <joe@...ches.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Fix  max-stack calculators to skip canary

Joe Perches wrote:

> Wouldn't it be better to have exactly the same code?
> How about using a statement expression macro?
> 
> #define DEBUG_STACK_FREE(process) \
> ({ \
> 	unsigned long *n = end_of_stack(process); \
> 	do { 	/* Skip over canary */\
> 		n++; \
> 	} while (!*n); \
> 	(unsigned long)n - (unsigned long)end_of_stack(process); \
> })
> 

That'd probably be good although I don't think we like macros anymore :)

-Eric
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