linux-kernel - Re: [PATCH] percpu-rwsem: use barrier in unlock path

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Date:	Wed, 17 Oct 2012 10:56:35 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH] percpu-rwsem: use barrier in unlock path

> a later stores, and stores are viewed in program order, so all x86
> stores have "release consistency" modulo the theoretical PPro bugs
> (that I don't think we actually ever saw in practice).

We did seem the for real. The PPro is on its way out however so I hardly
thing we care about optimising for that case.

Alan
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