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Date: Mon, 20 Aug 2007 09:15:11 -0400 From: Chris Snook <csnook@...hat.com> To: Linus Torvalds <torvalds@...ux-foundation.org> CC: Nick Piggin <piggin@...erone.com.au>, Satyam Sharma <satyam@...radead.org>, Herbert Xu <herbert@...dor.apana.org.au>, Paul Mackerras <paulus@...ba.org>, Christoph Lameter <clameter@....com>, Ilpo Jarvinen <ilpo.jarvinen@...sinki.fi>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Stefan Richter <stefanr@...6.in-berlin.de>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org, Netdev <netdev@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, ak@...e.de, heiko.carstens@...ibm.com, David Miller <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 Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures Linus Torvalds wrote: > So the only reason to add back "volatile" to the atomic_read() sequence is > not to fix bugs, but to _hide_ the bugs better. They're still there, they > are just a lot harder to trigger, and tend to be a lot subtler. What about barrier removal? With consistent semantics we could optimize a fair amount of code. Whether or not that constitutes "premature" optimization is open to debate, but there's no question we could reduce our register wiping in some places. -- Chris - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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