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Date:	Fri, 24 Aug 2007 13:50:44 +0100
From:	Denys Vlasenko <>
To:	Paul Mackerras <>
Cc:	Satyam Sharma <>,
	Stefan Richter <>,
	Christoph Lameter <>,
	Chris Snook <>,
	Linux Kernel Mailing List <>,,
	Linus Torvalds <>,, Andrew Morton <>,,,,,,,,,,,,,
	Herbert Xu <>,
	"Paul E. McKenney" <>
Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

On Thursday 16 August 2007 00:22, Paul Mackerras wrote:
> Satyam Sharma writes:
> In the kernel we use atomic variables in precisely those situations
> where a variable is potentially accessed concurrently by multiple
> CPUs, and where each CPU needs to see updates done by other CPUs in a
> timely fashion.  That is what they are for.  Therefore the compiler
> must not cache values of atomic variables in registers; each
> atomic_read must result in a load and each atomic_set must result in a
> store.  Anything else will just lead to subtle bugs.

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