linux-kernel - Re: [PATCH 1/2] percpu: add percpu_variable

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Message-ID: <4C21DFDD.9030107@cn.fujitsu.com>
Date:	Wed, 23 Jun 2010 18:20:13 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] percpu: add percpu_variable_ptr()

Tejun Heo wrote:
> On 06/23/2010 12:04 PM, Lai Jiangshan wrote:
>> The percpu variable and allocated percpu data are compatible
>> witch each other, This patch adds a API, thus we can use
>> per_cpu_ptr() for defined/declared percpu variable.
>>
>> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
>> ---
>> diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
>> index ce2dc65..d5c8d7f 100644
>> --- a/include/linux/percpu-defs.h
>> +++ b/include/linux/percpu-defs.h
>> @@ -81,6 +81,12 @@
>>  #endif
>>  
>>  /*
>> + * Ptr of the declared/defined per-CPU variable.
>> + * It is totally compatible with the return from alloc_percpu().
>> + */
>> +#define percpu_variable_ptr(name) (&(name))
> 
> Why not just use &name?
> 

I remember the real variable name is hidden.
We can't expose the inner details of percpu, so I add a macro for it.

Thanks,
Lai
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