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Date:	Mon, 20 Aug 2007 09:15:11 -0400
From:	Chris Snook <>
To:	Linus Torvalds <>
CC:	Nick Piggin <>,
	Satyam Sharma <>,
	Herbert Xu <>,
	Paul Mackerras <>,
	Christoph Lameter <>,
	Ilpo Jarvinen <>,
	"Paul E. McKenney" <>,
	Stefan Richter <>,
	Linux Kernel Mailing List <>,, Netdev <>,
	Andrew Morton <>,,, David Miller <>,,,,,,,,,
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all

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
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