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

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Message-ID: <Pine.LNX.4.64.0609131113550.18264@schroedinger.engr.sgi.com>
Date:	Wed, 13 Sep 2006 11:16:49 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	David Howells <dhowells@...hat.com>,
	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 Thu, 14 Sep 2006, Nick Piggin wrote:

> Oh really? OK I figured if ppc64 was OK then that would be enough,
> but your large Altix systems did slip my mind.

Look at the ia64 rwsem implementation in include/asm-ia64/rwsem.h.
 
> That is a fair criticism... atomic_long it will have to be, then.
> That will require a bit of atomic work to get atomic64_cmpxchg
> available on all 64-bit architectures.

I would greatly appreciate having that.

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