linux-kernel - Re: linux-next: build failure after merge of the final tree

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Message-ID: <20120706060834.GC5805@bubble.grove.modra.org>
Date:	Fri, 6 Jul 2012 15:38:34 +0930
From:	Alan Modra <amodra@...il.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, tony@...eyournoodle.com
Subject: Re: linux-next: build failure after merge of the final tree

On Fri, Jul 06, 2012 at 01:01:37PM +1000, Stephen Rothwell wrote:
> solos-pci.c:(.text+0x1ff923c): relocation truncated to fit: R_PPC64_REL24
                     ^^^^^^^^^

> I assume at this point, we are just too large.

Yeah, but not in total.  I didn't see any of these in the allyes
kernel I built with our proof of concept hack to avoid ld -r.  I think
you'll find that these are all from ld -r output, as I assume no one
in kernel land writes drivers or whatever with 33M of text in a single
file.  Branches in that monstrous section can't even reach the
trampolines that ld inserts to extend branch reach.  Did I mention
that ld -r is a bad idea?

One workaround might be to compile with -ffunction-sections.

-- 
Alan Modra
Australia Development Lab, IBM
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