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

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Message-ID: <CA+55aFw-1oeOvH2eJgoJc5eU-0RRVER+gqqAkCYmJ+4MNpz53w@mail.gmail.com>
Date:	Thu, 20 Feb 2014 11:06:37 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Torvald Riegel <triegel@...hat.com>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	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, Feb 20, 2014 at 11:02 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Again, the way I'd expect a compiler writer to actually *do* this is
> to just default to "ac

Oops, pressed send by mistake too early.

I was almost done:

I'd expect a compiler to just default to "acquire" semantics, but then
have a few "obvious peephole" optimizations for cases that it
encounters and where it is easy to replace the synchronization point
with just an address dependency.

             Linus
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