linux-kernel - Re: [RFC][PATCH 0/5] arch: atomic rework

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Message-ID: <1392918846.18779.10204.camel@triegel.csb>
Date:	Thu, 20 Feb 2014 18:54:06 +0100
From:	Torvald Riegel <triegel@...hat.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Will Deacon <will.deacon@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
	David Howells <dhowells@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"gcc@....gnu.org" <gcc@....gnu.org>
Subject: Re: [RFC][PATCH 0/5] arch: atomic rework

On Thu, 2014-02-20 at 00:30 -0800, Paul E. McKenney wrote:
> Well, all the compilers currently convert consume to acquire, so you have
> your wish there.  Of course, that also means that they generate actual
> unneeded memory-barrier instructions, which seems extremely sub-optimal
> to me.

GCC doesn't currently, but it also doesn't seem to track the
dependencies, but that's a bug:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59448

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