linux-kernel - Re: [PATCH 1/5] asm-generic: Add _{relaxed|acquire|release}() variants for inc/dec atomics

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Message-ID: <20151005194824.GF3816@twins.programming.kicks-ass.net>
Date:	Mon, 5 Oct 2015 21:48:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Davidlohr Bueso <dave@...olabs.net>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Paul E.McKenney" <paulmck@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 1/5] asm-generic: Add _{relaxed|acquire|release}()
 variants for inc/dec atomics

On Mon, Oct 05, 2015 at 06:32:43PM +0100, Will Deacon wrote:
> On Thu, Oct 01, 2015 at 07:39:10AM +0100, Peter Zijlstra wrote:
> > On Wed, Sep 30, 2015 at 01:03:11PM -0700, Davidlohr Bueso wrote:
> > > Similar to what we have for regular add/sub calls. For now, no actual arch
> > > implements them, so everyone falls back to the default atomics... iow,
> > > nothing changes. These will be used in future primitives.
> > > 
> > 
> > Maybe also do an aargh64 patch for this?
> 
> I can follow up with that, since I'm about 60% through adding the
> relaxed/acquire/release versions of all the other primitives. It's a fair
> amount of work thanks to the new atomic instructions making me do everything
> twice... (that and I've been on holiday this past week!)

Right, what I meant was arm (I thought argh64 was the one with _relaxed
bits in, but my memories tricked me, it was ARM).

If you add new _relaxed ops, we'd better convert all archs that support
_relaxed, which would be ARM (for now).
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