linux-kernel - Re: [v2 3/3] ARM: tegra: Unify Device tree board files

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Message-Id: <201302122225.58322.arnd@arndb.de>
Date:	Tue, 12 Feb 2013 22:25:58 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Hiroshi Doyu <hdoyu@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"marvin24@....de" <marvin24@....de>, "balbi@...com" <balbi@...com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [v2 3/3] ARM: tegra: Unify Device tree board files

On Tuesday 12 February 2013, Stephen Warren wrote:
> I believe U-Boot enabled -ffunction-sections -fdata-sections or similar
> (recently?) to get this kind of behaviour. I wonder why the kernel
> didn't need that. Perhaps -O2 is more aggressive (within a file at
> least) than I thought.

-ffunction-sections works across files, while the trick I described
only works on file static symbols. David Woodhouse at some point
had a working kernel build with -ffunction-sections but for some
reason that never got merged.

	Arnd
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