linux-kernel - Re: [PATCH 4/4] locking: Introduce smp_cond

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Message-ID: <8722.1446496609@warthog.procyon.org.uk>
Date:	Mon, 02 Nov 2015 20:36:49 +0000
From:	David Howells <dhowells@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	dhowells@...hat.com, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	boqun.feng@...il.com, Jonathan Corbet <corbet@....net>,
	Michal Hocko <mhocko@...nel.org>,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH 4/4] locking: Introduce smp_cond_acquire()

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> > +       smp_read_barrier_depends(); /* ctrl */  \
> > +       smp_rmb(); /* ctrl + rmb := acquire */  \

Doesn't smp_rmb() imply an smp_read_barrier_depends() anyway?  In
memory-barriers.txt, it says:

     Read memory barriers imply data dependency barriers, and so can
     substitute for them.

David
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