linux-kernel - Re: [PATCH 3/3] WorkStruct: Use direct assignment rather than cmpxchg()

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Message-ID: <10660.1165526163@redhat.com>
Date:	Thu, 07 Dec 2006 21:16:03 +0000
From:	David Howells <dhowells@...hat.com>
To:	James Bottomley <James.Bottomley@...elEye.com>
Cc:	David Howells <dhowells@...hat.com>, Andrew Morton <akpm@...l.org>,
	torvalds@...l.org, davem@...emloft.com, wli@...omorphy.com,
	matthew@....cx, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 3/3] WorkStruct: Use direct assignment rather than cmpxchg() 

James Bottomley <James.Bottomley@...elEye.com> wrote:

> That we'd have to put a conditional jump in there is an incorrect
> assumption on risc machines.

I didn't say we would *have* to put a conditional jump in there.  But I don't
know that I it can be avoided on all archs.

I don't know that sparc32 can do conditional instructions for example.  If we
force this assumption it becomes a potential limitation on the archs we can
support.  OTOH, it may be that every arch that supports SMP and has to emulate
bitops with spinlocks also supports conditional stores; but I don't know that.

David
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