linux-kernel - Re: Why Semaphore Hardware-Dependent?

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Message-ID: <20060829162055.GA31159@linux-mips.org>
Date:	Tue, 29 Aug 2006 17:20:55 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Christoph Lameter <clameter@....com>
Cc:	David Howells <dhowells@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Arjan van de Ven <arjan@...radead.org>,
	Dong Feng <middle.fengdong@...il.com>, ak@...e.de,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: Why Semaphore Hardware-Dependent?

On Tue, Aug 29, 2006 at 08:56:36AM -0700, Christoph Lameter wrote:

> > Because i386 (and x86_64) can do better by using XADDL/XADDQ.
> 
> And Ia64 would like to use fetchadd....
> 
> > CMPXCHG is not available on all archs, and may not be implemented on all archs
> > through other atomic instructions.
> 
> Which arches do not support cmpxchg?

MIPS, Alpha - probably any pure RISC load/store architecture.

  Ralf
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