linux-kernel - Re: [PATCH] prepare kconfig inline optimization for all architectures

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Date:	Mon, 28 Apr 2008 01:41:10 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Sam Ravnborg <sam@...nborg.org>, Adrian Bunk <bunk@...nel.org>,
	linux arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH] prepare kconfig inline optimization for all
	architectures


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Sun, 27 Apr 2008, Arjan van de Ven wrote:
> > 
> > (actually, other than some obscure commandline options, the only 
> > sane way to avoid gcc doing this too agressive is using -Os)
> 
> Well, CC_OPTIMIZE_FOR_SIZE has been defaulting to 'y' for a *loong* 
> time, but it's hidden behind a EXPERIMENTAL (unless you were on some 
> embedded architectures), so many people won't see it.
> 
> Perhaps it is time to remove the EXPERIMENTAL? I think the gcc 
> warnings were mostly bogus - it's not as if there haven't been 
> compiler bugs without -Os too..

i was wondering about that when doing the OPTIMIZE_INLINING change - 
lets do something like the patch below?

	Ingo

-------------->
Subject: make CC_OPTIMIZE_FOR_SIZE non-experimental
From: Ingo Molnar <mingo@...e.hu>
Date: Mon Apr 28 01:39:43 CEST 2008

this option has been the default on a wide range of distributions
for a long time - time to make it non-experimental.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 init/Kconfig |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

Index: linux-x86.q/init/Kconfig
===================================================================
--- linux-x86.q.orig/init/Kconfig
+++ linux-x86.q/init/Kconfig
@@ -496,16 +496,12 @@ source "usr/Kconfig"
 endif
 
 config CC_OPTIMIZE_FOR_SIZE
-	bool "Optimize for size (Look out for broken compilers!)"
+	bool "Optimize for size"
 	default y
-	depends on ARM || H8300 || SUPERH || EXPERIMENTAL
 	help
 	  Enabling this option will pass "-Os" instead of "-O2" to gcc
 	  resulting in a smaller kernel.
 
-	  WARNING: some versions of gcc may generate incorrect code with this
-	  option.  If problems are observed, a gcc upgrade may be needed.
-
 	  If unsure, say N.
 
 config SYSCTL
--
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