linux-kernel - Re: [PATCH] i386: Fix a couple busy loops in mach_wakecpu.h:wait_for_init

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Message-ID: <Pine.LNX.4.64.0708241005360.20501@schroedinger.engr.sgi.com>
Date:	Fri, 24 Aug 2007 10:06:29 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Satyam Sharma <satyam@...radead.org>
cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Chris Snook <csnook@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	ak@...e.de, 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, segher@...nel.crashing.org,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [PATCH] i386: Fix a couple busy loops in mach_wakecpu.h:wait_for_init_deassert()

On Fri, 24 Aug 2007, Satyam Sharma wrote:

> But if people do seem to have a mixed / confused notion of atomicity
> and barriers, and if there's consensus, then as I'd said earlier, I
> have no issues in going with the consensus (eg. having API variants).
> Linus would be more difficult to convince, however, I suspect :-)

The confusion may be the result of us having barrier semantics in 
atomic_read. If we take that out then we may avoid future confusions.

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