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Subject: Re: [PATCH 1/4] atomic_cmpxchg and friends
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel <linux-kernel@vger.kernel.org>
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Date: Sun, 25 Sep 2005 22:09:31 +0100
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+#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old,
new))
+

Not all X86 has cmpxchg so the code there won't compile for all cases.