linux-kernel - Re: [patch 1/3] move WARN

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Message-ID: <20080103092502.GA16096@elte.hu>
Date:	Thu, 3 Jan 2008 10:25:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 1/3] move WARN_ON() out of line

* Arjan van de Ven <arjan@...ux.intel.com> wrote:

> +#define WARN_ON(condition) do_warn_on((unsigned long)(condition), __FILE__, \
> +					 __LINE__, __FUNCTION__)

hm. This passes in 4 arguments to do_warn_on().

i think we could get away with no arguments (!), by using section 
tricks. Firstly, we can get rid of __FUNCTION__ and replace it with a 
ksyms lookup - that is fine enough. Secondly, we could put __FILE__ and 
__LINE__ into a text section and key it up to the return address from 
do_warn_on().

the condition code should not be passed in at all i think - it creates 
extra function calls to do_warn_on() all the time.

	Ingo
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