linux-kernel - Re: Linux 3.19-rc3

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Message-ID: <20150106124528.GE26845@kmo-pixel>
Date:	Tue, 6 Jan 2015 04:45:28 -0800
From:	Kent Overstreet <kmo@...erainc.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Sedat Dilek <sedat.dilek@...il.com>,
	Dave Jones <davej@...emonkey.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Chris Mason <clm@...com>
Subject: Re: Linux 3.19-rc3

On Tue, Jan 06, 2015 at 01:20:06PM +0100, Peter Zijlstra wrote:
> We (probably me) should probably audit all the atomic_xchg()
> implementations and documentation and fix that. I was very much under
> the impression it should imply a full barrier (and it certainly does on
> x86), the documentation should state the rule that any atomic_ function
> that returns a result is fully serializing, therefore, because
> atomic_xchg() has a return value, it should too.

I think that the documentation was changed awhile ago - I'd have to check and I
should sleep, though. It was probably 4-5 years ago that I saw that old weird
"atomic_xchg() doesn't imply barriers" thing.
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