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

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Message-Id: <1215010662.10393.459.camel@pmac.infradead.org>
Date:	Wed, 02 Jul 2008 15:57:42 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	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 17:55 +0300, Adrian Bunk wrote:
> On Wed, Jul 02, 2008 at 09:41:47AM +0100, David Woodhouse wrote:
> > 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.
> >...
> 
> Is there any specific reason why it's not done in the upstream kernel?

Isn't it? I thought it was.

Or maybe we were only doing that before we added MMU support. I remember
the exception tables complicate matters a little.

-- 
dwmw2

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