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From: David Howells <dhowells@redhat.com>
In-Reply-To: <439E122E.3080902@yahoo.com.au> 
References: <439E122E.3080902@yahoo.com.au>  <dhowells1134431145@warthog.cambridge.redhat.com> 
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: David Howells <dhowells@redhat.com>, torvalds@osdl.org, akpm@osdl.org,
       hch@infradead.org, arjan@infradead.org, matthew@wil.cx,
       linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation 
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Date: Tue, 13 Dec 2005 09:54:49 +0000
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Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> We have atomic_cmpxchg. Can you use that for a sufficient generic
> implementation?

No. CMPXCHG/CAS is not as available as XCHG, and it's also unnecessary.

David