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

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Date:	Fri, 24 Aug 2007 21:26:57 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Satyam Sharma <satyam@...radead.org>,
	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 Friday 24 August 2007 18:06, Christoph Lameter wrote:
> 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.

I think better name may help. Nuke atomic_read() altogether.

n = atomic_value(x);	// doesnt hint as strongly at reading as "atomic_read"
n = atomic_fetch(x);	// yes, we _do_ touch RAM
n = atomic_read_uncached(x); // or this

How does that sound?
--
vda
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