linux-kernel - Re: [Use cpuops V1 04/11] x86: Use this_cpu_ops for current_cpu

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Date:	Tue, 07 Dec 2010 15:59:44 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
CC:	akpm@...ux-foundation.org, Yinghai Lu <yinghai@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [Use cpuops V1 04/11] x86: Use this_cpu_ops for current_cpu_data
 accesses

On 12/07/2010 03:46 PM, Christoph Lameter wrote:
> On Tue, 7 Dec 2010, Tejun Heo wrote:
> 
>>> This belongs to the previous patch, right?  I'll move it over and
>>> apply 03 and 04.  I think routing these through percpu is okay but if
>>> anyone wants these to go through x86, scream.
>>
>> Ooh, was too fast.  I think mixing the use of percpu accesses to
>> cpu_info and the wrapper macro current_cpu_data is quite confusing.
>> There aren't too many current_cpu_data users in x86 anyway.  Can you
>> please make the conversion complete?  I'm moving the above misplaced
>> chunk into 03 and not applying 04 for now.
> 
> We cannot make that conversion complete since we cannot obtain the address
> if we use a this_cpu operation. Then its better to drop this patch.

No, I was talking about dropping current_cpu_data macro.  We can use
__this_cpu_ptr() for addresses.  I just find it very confusing to mix
current_cpu_data and using direct percpu accessors on cpu_info.

Thanks.

-- 
tejun
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