linux-kernel - Re: [cpuops cmpxchg V2 5/5] cpuops: Use cmpxchg for xchg to avoid lock semantics

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Message-ID: <4D08EE57.8010602@zytor.com>
Date:	Wed, 15 Dec 2010 08:35:35 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Christoph Lameter <cl@...ux.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	akpm@...ux-foundation.org, Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [cpuops cmpxchg V2 5/5] cpuops: Use cmpxchg for xchg to avoid
 lock semantics

On 12/15/2010 08:29 AM, Tejun Heo wrote:
> Hello,
> 
> On 12/15/2010 02:06 AM, H. Peter Anvin wrote:
>> It's probably easiest if you just add them with my Acked-by: then.
>> Alternatively, I could pick them up so they go into -tip and the tip
>> test machinery.
> 
> All patches accepted into percpu till now are in the following branch.
> 
>  git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-next
> 
> The tree is based on v2.6.37-rc5 and v2.6.37-rc5..for-next would give
> 21 patches.  I think most of these don't fit x86 tree but there are
> several which would fit there much better.  d80aadf9 (x86: Replace
> uses of current_cpu_data with this_cpu ops) and e5195e91 (x86: Use
> this_cpu_inc_return for nmi counter).
> 
> As it would be beneficial to push these through -tip testing anyway,
> how about the following?
> 
> * If you review and ack the x86 related bits in the series, I'll
>   regenerated and add the ACKs.
> 
> * It would be better if the two commits mentioned above get routed
>   through x86 tree rather than percpu tree, so I'll drop the above two
>   from percpu tree and you can pull percpu into x86 and then apply
>   those in x86 tree.
> 

I think we can do that... let me look through the tree first officially
committing.  Alternatively, I can pull the patches from your tree and
individually review them and add them to a tip branch, if you prefer.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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