linux-kernel - Re: linux-next: origin tree build failure

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Date:	Tue, 14 Apr 2009 11:20:34 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	sfr@...b.auug.org.au, torvalds@...ux-foundation.org,
	linux-next@...r.kernel.org, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: linux-next: origin tree build failure

On Tue, 14 Apr 2009 01:57:27 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Tue, 14 Apr 2009 14:43:17 +1000
> 
> > Dave, arch/sparc/include/asm/atomic_32.h should really include
> > asm/system.h since xchg is used in there.
> 
> That's true.
> 
> But atomic.h is not the proper place to obtain xchg() from, which is
> asm/system.h, and that's what debug_locks.h needs to include if it
> needs to use xchg().
> 
> This is why the s390 build broke in precisely the same way.

Due to header include dependencies we can't include asm/system.h from
asm/atomic.h. So David's solution seems to be the right way.
How about this:

Subject: [PATCH] Fix xchg build breakage on s390.

From: Heiko Carstens <heiko.carstens@...ibm.com>

In file included from kernel/panic.c:11:
include/linux/debug_locks.h: In function '__debug_locks_off':
include/linux/debug_locks.h:15: error: implicit declaration of function 'xchg'

Caused by 9eeba6138cefc0435695463ddadb0d95e0a6bcd2
"lockdep: warn about lockdep disabling after kernel taint"

Cc: Frederic Weisbecker <fweisbec@...il.com>
Reported-by: Sachin Sant <sachinp@...ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
---

 include/linux/debug_locks.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/include/linux/debug_locks.h
===================================================================
--- linux-2.6.orig/include/linux/debug_locks.h
+++ linux-2.6/include/linux/debug_locks.h
@@ -2,7 +2,7 @@
 #define __LINUX_DEBUG_LOCKING_H
 
 #include <linux/kernel.h>
-#include <asm/atomic.h>
+#include <asm/system.h>
 
 struct task_struct;
 
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