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

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Date:	Thu, 14 Sep 2006 04:13:00 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <clameter@....com>
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?

Christoph Lameter wrote:
> On Thu, 14 Sep 2006, Nick Piggin wrote:
> 
> 
>>Comments?
> 
> 
> You only support 64k waiters. We have had cases of software failing 
> because more than 64k readers were waiting.

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

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.

> Please sent patches inline in order for us to be able to comment.

OK I will for next patchset.

-- 
SUSE Labs, Novell Inc.
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