linux-kernel - Re: linux-next: build failure after merge of the final tree (powerpc related)

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Message-ID: <20120621114354.GG20973@bubble.grove.modra.org>
Date:	Thu, 21 Jun 2012 21:13:54 +0930
From:	Alan Modra <amodra@...il.com>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	linux-kernel@...r.kernel.org
Subject: Re: linux-next: build failure after merge of the final tree (powerpc
 related)

On Thu, Jun 21, 2012 at 08:18:39PM +0930, Alan Modra wrote:
> Linker bug.  That's not a sibling call, but a normal function return
> via an out-of-line register restore function.

I couldn't see how this might be occurring, then I remembered the
kernel has this horrible practise of using ld -r to package object
files.  So linker generated functions might be munged together with
other functions.  Does this help?  (It won't if the kernel is
providing its own save/restore functions.)

Index: bfd/elf64-ppc.c
===================================================================
RCS file: /cvs/src/src/bfd/elf64-ppc.c,v
retrieving revision 1.387
diff -u -p -r1.387 elf64-ppc.c
@@ -6494,9 +6494,10 @@ ppc64_elf_func_desc_adjust (bfd *obfd AT
 
   /* Provide any missing _save* and _rest* functions.  */
   htab->sfpr->size = 0;
-  for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++)
-    if (!sfpr_define (info, &funcs[i]))
-      return FALSE;
+  if (!info->relocatable)
+    for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++)
+      if (!sfpr_define (info, &funcs[i]))
+	return FALSE;
 
   elf_link_hash_traverse (&htab->elf, func_desc_adjust, info);
 


-- 
Alan Modra
Australia Development Lab, IBM
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