linux-kernel - Re: [PATCH 06/20] arch,avr32: Fold atomic

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Message-ID: <20140509205155.GH1429@laptop.programming.kicks-ass.net>
Date:	Fri, 9 May 2014 22:51:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Hans-Christian Egtvedt <egtvedt@...fundet.no>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	mingo@...nel.org, will.deacon@....com, paulmck@...ux.vnet.ibm.com,
	Haavard Skinnemoen <hskinnemoen@...il.com>
Subject: Re: [PATCH 06/20] arch,avr32: Fold atomic_ops

On Fri, May 09, 2014 at 10:43:09PM +0200, Peter Zijlstra wrote:
> On Fri, May 09, 2014 at 08:32:41PM +0200, Hans-Christian Egtvedt wrote:

> > > -	if (__builtin_constant_p(i) && (i >= -1048575) && (i <= 1048576))
> > > -		result = atomic_sub_return(-i, v);
> > 
> > I do not recall why we did it like this any more, I would assume both sub and
> > add to be single cycle instructions.

Similarly, can I rip out atomic_sub_unless() ?
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