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Date: Mon, 19 Dec 2005 02:34:42 +0100
From: Ingo Molnar <mingo@elte.hu>
To: linux-kernel@vger.kernel.org, Linus Torvalds <torvalds@osdl.org>,
       Andrew Morton <akpm@osdl.org>
Cc: Arjan van de Ven <arjanv@infradead.org>,
       Steven Rostedt <rostedt@goodmis.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Christoph Hellwig <hch@infradead.org>, Andi Kleen <ak@suse.de>,
       David Howells <dhowells@redhat.com>,
       Alexander Viro <viro@parcelfarce.linux.theplanet.co.uk>,
       Oleg Nesterov <oleg@tv-sign.ru>, Paul Jackson <pj@sgi.com>
Subject: [patch 02/15] Generic Mutex Subsystem, add-atomic-xchg-x86_64.patch
Message-ID: <20051219013442.GC27658@elte.hu>
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add atomic_cmpxchg() to x86_64. Needed by the new mutex code.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

----

 include/asm-x86_64/atomic.h |    1 +
 1 files changed, 1 insertion(+)

Index: linux/include/asm-x86_64/atomic.h
===================================================================
--- linux.orig/include/asm-x86_64/atomic.h
+++ linux/include/asm-x86_64/atomic.h
@@ -389,6 +389,7 @@ static __inline__ long atomic64_sub_retu
 #define atomic64_dec_return(v)  (atomic64_sub_return(1,v))
 
 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value