linux-kernel - Re: [PATCH 9/24] make atomic_read() behave consistently on ia64

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Message-ID: <46BFFA71.4080601@redhat.com>
Date:	Mon, 13 Aug 2007 02:30:09 -0400
From:	Chris Snook <csnook@...hat.com>
To:	Paul Mackerras <paulus@...ba.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	Andreas Schwab <schwab@...e.de>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, netdev@...r.kernel.org,
	akpm@...ux-foundation.org, ak@...e.de, heiko.carstens@...ibm.com,
	davem@...emloft.net, schwidefsky@...ibm.com, wensong@...ux-vs.org,
	horms@...ge.net.au, wjiang@...ilience.com, cfriesen@...tel.com,
	zlynx@....org, rpjday@...dspring.com, jesper.juhl@...il.com
Subject: Re: [PATCH 9/24] make atomic_read() behave consistently on ia64

Paul Mackerras wrote:
> Chris Snook writes:
> 
>> I'll do this for the whole patchset.  Stay tuned for the resubmit.
> 
> Could you incorporate Segher's patch to turn atomic_{read,set} into
> asm on powerpc?  Segher claims that using asm is really the only
> reliable way to ensure that gcc does what we want, and he seems to
> have a point.
> 
> Paul.

I haven't seen a patch yet.  I'm going to resubmit with inline volatile-cast 
atomic[64]_[read|set] on all architectures as a reference point, and if anyone 
wants to go and implement some of them in assembly, that's between them and the 
relevant arch maintainers.  I have no problem with (someone else) doing it in 
assembly.  I just don't think it's necessary and won't let it hold up the effort 
to get consistent behavior on all architectures.

	-- Chris
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