linux-kernel - Re: [PATCH 14/23] make section names compatible with -ffunction-sections -fdata-sections: parisc

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Date:	Wed, 02 Jul 2008 09:41:47 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	linux-arch@...r.kernel.org, Russell King <rmk@....linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Lennert Buytenhek <kernel@...tstofly.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Andi Kleen <andi@...stfloor.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-embedded@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tim Bird <tim.bird@...sony.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Dave Miller <davem@...emloft.net>
Subject: Re: [PATCH 14/23] make section names compatible with
	-ffunction-sections -fdata-sections: parisc

On Wed, 2008-07-02 at 02:00 +0200, Denys Vlasenko wrote:
> On Wednesday 02 July 2008 01:41, James Bottomley wrote:
> > On Wed, 2008-07-02 at 02:39 +0200, Denys Vlasenko wrote:
> > > The purpose of this patch is to make kernel buildable
> > > with "gcc -ffunction-sections -fdata-sections".
> > > This patch fixes parisc architecture.
> > > 
> > > Signed-off-by: Denys Vlasenko <vda.linux@...glemail.com>
> > 
> > Um ... if you look at the Makefile you'll see we already build parisc
> > with -ffunction-sections; we have to: our relative jumps are too small
> > to guarantee finding the stubs in large files.
> > 
> > Since our text is -ffunction-sections compatible already, I question the
> > need for transformations like this:

We've been building FR-V kernels with --gc-sections for a long time,
too.

> In order to handle these situations uniformly, in these patches
> I decided to _never_ use .text.XXXX names for sections,
> effectively leaving them "reserved for gcc's use".

It makes a certain amount of sense to do this uniformly for all
architectures -- leaving .text.* and .data.* for GCC, and using
something else whenever we manually name sections. 

Denys' patch for parisc would need a little more thought, but it's
probably worth it to be consistent. Especially if we can move more stuff
out of athe arch-specific linker scripts and into
<asm-generic/vmlinux.lds.h>

-- 
dwmw2

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