linux-kernel - Re: [PATCH v2 0/4] Add support for compiling with -ffunction-sections -fdata-sections

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Message-ID: <20090421140228.GC3303@hack>
Date:	Tue, 21 Apr 2009 22:02:28 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Tim Abbott <tabbott@....EDU>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Anders Kaseorg <andersk@....edu>,
	Waseem Daher <wdaher@....edu>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Jeff Arnold <jbarnold@....edu>
Subject: Re: [PATCH v2 0/4] Add support for compiling with
	-ffunction-sections -fdata-sections

On Sun, Apr 05, 2009 at 07:14:34PM -0400, Tim Abbott wrote:
>Hi Linus,
>
>Here is a new version of the -ffunction-sections -fdata-sections patch
>series based on your current master.  Please apply.
>
>When I sent a version of this patch series at the start of the merge
>window, Stephen Rothwell pointed out that the first patch conflicted
>with several changes in linux-next, and it should be resent near the
>end of the merge window once those changes were merged.  There are
>now no conflicting changes staged in linux-next[0], so now is probably
>the optimal time to merge this patch series.
>
>[0] There is one trivial merge conflict with next-20090403 because
>e5083a63b6a8546c5fe1e571fe529e3939787ec2 was merged into master since
>then, but this will presumably disappear when next catches up tomorrow.
>
>	-Tim Abbott
>
>--
>
>The purpose of this patch series is to make it possible to build the
>kernel with "gcc -ffunction-sections -fdata-sections".  There are two
>major applications for this functionality: decreasing vmlinux image
>size with --gc-sections, and Ksplice.

Hello, Tim!

Nice work! But, don't -ffunction-sections and -fdata-sections have
collisions with '-g' and 'gprof'? Just like what gcc(1) describes.

CONFIG_DEBUG_INFO relies on '-g', and IIRIC, another project of
linux kernel is trying to 'gprof' the kernel too.

So, CONFIG_FUNCTION_DATA_SECTIONS probably needs to depend on
!CONFIG_DEBUG_INFO etc.

Am I missing something?

Thanks.

-- 
Live like a child, think like the god.
 
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