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

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Message-ID: <5878.1156868702@warthog.cambridge.redhat.com>
Date:	Tue, 29 Aug 2006 17:25:02 +0100
From:	David Howells <dhowells@...hat.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Christoph Lameter <clameter@....com>,
	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? 

Ralf Baechle <ralf@...ux-mips.org> wrote:

> > Which arches do not support cmpxchg?
> 
> MIPS, Alpha - probably any pure RISC load/store architecture.

Some of these have LL/SC or equivalent instead, but ARM5 and before, FRV, M68K
before 68020 to name but a few.

And anything that implements CMPXCHG with spinlocks is a really bad candidate
for CMPXCHG-based rwsems.

David
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