linux-kernel - Re: [PATCH] elfcore.h : Fix UML build breakage

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Message-ID: <alpine.DEB.2.00.0907081141500.4155@parag-desktop>
Date:	Wed, 8 Jul 2009 11:46:02 -0400 (EDT)
From:	Parag Warudkar <parag.lkml@...il.com>
To:	Amerigo Wang <xiyou.wangcong@...il.com>
cc:	Parag Warudkar <parag.lkml@...il.com>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, teawater@...il.com, mingo@...e.hu,
	tj@...nel.org
Subject: Re: [PATCH] elfcore.h : Fix UML build breakage



On Wed, 8 Jul 2009, Amerigo Wang wrote:

> On Tue, Jul 07, 2009 at 10:41:50PM -0400, Parag Warudkar wrote:
> >Commit a65e7bfcd74e4c0939f235d2bf9f48ddb3a57991 breaks UML build with 
> >below error - 
> >
> >In file included from fs/proc/kcore.c:17:
> >include/linux/elfcore.h: In function ‘elf_core_copy_task_regs’:
> >include/linux/elfcore.h:129: error: implicit declaration of function 
> >‘task_pt_regs’
> >
> >Fix this by restoring the previous behavior of returning 0 for all arches 
> >like UML that don't define task_pt_regs.

> #elif defined doesn't match #ifdef well, how about:
> 
> #if defined (ELF_CORE_COPY_TASK_REGS)
> ...
> #elif defined (task_pt_regs)
> ...
> #endif

Updated patch below -

Fix UML build breakage due to commit 
a65e7bfcd74e4c0939f235d2bf9f48ddb3a57991.

Signed-off-by: Parag Warudkar <parag.lkml@...il.com>

diff --git a/include/linux/elfcore.h b/include/linux/elfcore.h
index 03ec167..00d6a68 100644
--- a/include/linux/elfcore.h
+++ b/include/linux/elfcore.h
@@ -122,10 +122,9 @@ static inline void elf_core_copy_kernel_regs(elf_gregset_t *elfregs, struct pt_r
 
 static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
 {
-#ifdef ELF_CORE_COPY_TASK_REGS
-	
+#if defined (ELF_CORE_COPY_TASK_REGS)
 	return ELF_CORE_COPY_TASK_REGS(t, elfregs);
-#else
+#elif defined (task_pt_regs)
 	elf_core_copy_regs(elfregs, task_pt_regs(t));
 #endif
 	return 0;