linux-kernel - Re: [patch 2/5] move WARN

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Message-ID: <20080106194005.GA7992@lixom.net>
Date:	Sun, 6 Jan 2008 13:40:05 -0600
From:	Olof Johansson <olof@...om.net>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	heiko.carstens@...ibm.com, mingo@...e.hu, mpm@...enic.com
Subject: Re: [patch 2/5] move WARN_ON() out of line

On Sat, Jan 05, 2008 at 07:09:59PM -0800, Arjan van de Ven wrote:
> From: Arjan van de Ven <arjan@...ux.intel.com>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: Olof Johansson <olof@...om.net>
> Acked-by: Matt Meckall <mpm@...enic.com>
> 
> A quick grep shows that there are currently 1145 instances of WARN_ON
> in the kernel. Currently, WARN_ON is pretty much entirely inlined,
> which makes it hard to enhance it without growing the size of the kernel
> (and getting Andrew unhappy).
> 
> This patch build on top of Olof's patch that introduces __WARN,
> and places the slowpath out of line. It also uses Ingo's suggestion
> to not use __FUNCTION__ but to use kallsyms to do the lookup;
> this saves a ton of extra space since gcc doesn't need to store the function
> string twice now:
> 
> 3936367  833603  624736 5394706  525112 vmlinux.before
> 3917508  833603  624736 5375847  520767 vmlinux-slowpath
> 
> 15Kb savings...
> 
> Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>

Acked-by: Olof Johansson <olof@...om.net>

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