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

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Date:	Mon, 10 Feb 2014 16:08:11 -0500
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 0/5] arch: atomic rework

(+LKML again)

On 2/10/2014 3:57 PM, Peter Zijlstra wrote:
> On Mon, Feb 10, 2014 at 03:50:04PM -0500, Chris Metcalf wrote:
>> On 2/6/2014 8:52 AM, Peter Zijlstra wrote:
>>> Its been compiled on everything I have a compiler for, however frv and
>>> tile are missing because they're special and I was tired.
>> So what's the specialness on tile?
> Its not doing the atomic work in ASM but uses magic builtins or such.
>
> I got the list of magic funcs for tilegx, but didn't look into the 32bit
> chips.

Oh, I see.  The <asm/atomic.h> files on tile are already reasonably well-factored.

It's possible you could do better, but I think not by too much, other than possibly
by using <asm-generic/atomic.h> for some of the common idioms like "subtraction
is addition with a negative second argument", etc., which hasn't been done elsewhere.

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com

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