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Subjectlinux-next: origin tree build failure
Hi all,

Today's linux-next build (sparc defconfig) failed like this:

In file included from kernel/panic.c:12:
include/linux/debug_locks.h: In function '__debug_locks_off':
include/linux/debug_locks.h:15: error: implicit declaration of function 'xchg'

Caused by commit 9eeba6138cefc0435695463ddadb0d95e0a6bcd2 ("lockdep: warn
about lockdep disabling after kernel taint"). xchg is defined in
asm/system.h on sparc. It looks like asm/atomic.h on 64bit sparc includes
asm/system.h, but not on 32bit.

Dave, arch/sparc/include/asm/atomic_32.h should really include
asm/system.h since xchg is used in there.

I have applied the following patch for today.
Stephen Rothwell

From: Stephen Rothwell <>
Date: Tue, 14 Apr 2009 14:27:09 +1000
Subject: [PATCH] sparc: asm/atomic.h on 32bit should include asm/system.h for xchg

Signed-off-by: Stephen Rothwell <>
arch/sparc/include/asm/atomic_32.h | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/sparc/include/asm/atomic_32.h b/arch/sparc/include/asm/atomic_32.h
index ce46597..bb91b12 100644
--- a/arch/sparc/include/asm/atomic_32.h
+++ b/arch/sparc/include/asm/atomic_32.h
@@ -15,6 +15,8 @@

#ifdef __KERNEL__

+#include <asm/system.h>
#define ATOMIC_INIT(i) { (i) }

extern int __atomic_add_return(int, atomic_t *);

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