linux-kernel - Re: [PATCH] bitops: Use volatile in generic atomic bitops.

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Message-ID: <CAFbHwiQPQVF68=-Z315cE1DOj7bB4zVnnoXV6w3D9891FKi+GA@mail.gmail.com>
Date:	Wed, 27 Jul 2011 16:59:10 +0100
From:	Will Newton <will.newton@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bitops: Use volatile in generic atomic bitops.

On Wed, Jul 27, 2011 at 4:22 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 27 July 2011, Will Newton wrote:
>> Imagination Technologies META, which is a custom in-house
>> architecture. No immediate plans to upstream unfortunately. :-/
>
> Ah, interesting. We have a few other DSP architectures lined up
> for upstream integration. Let me know when you get there as well.
> Is there a git tree available somewhere?

Not at the moment. It's something I would like to have though.

>> FWIW I checked all the in-tree architectures and it seems everyone
>> else gets this right (although I got a bit lost with tile).
>
> Yes, I think that you get into a lot of other problems if you
> mess up the basic synchronization primitives, so they would have
> noticed at some point.

On the contrary, the system was remarkably stable and the issue only
showed up in one particular driver under heavy load. ;-)
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