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Message-ID: <496F0F5E.3080404@kernel.org>
Date: Thu, 15 Jan 2009 19:26:38 +0900
From: Tejun Heo <tj@...nel.org>
To: roel kluin <roel.kluin@...il.com>
CC: Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Brian Gerst <brgerst@...il.com>, ebiederm@...ssion.com,
cl@...ux-foundation.org, rusty@...tcorp.com.au, travis@....com,
linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
steiner@....com, hugh@...itas.com
Subject: Re: [patch] add optimized generic percpu accessors
roel kluin wrote:
>> Index: linux/include/asm-generic/percpu.h
>> ===================================================================
>> --- linux.orig/include/asm-generic/percpu.h
>> +++ linux/include/asm-generic/percpu.h
>> @@ -80,4 +80,32 @@ extern void setup_per_cpu_areas(void);
>> #define DECLARE_PER_CPU(type, name) extern PER_CPU_ATTRIBUTES \
>> __typeof__(type) per_cpu_var(name)
>>
>> +/*
>> + * Optional methods for optimized non-lvalue per-cpu variable access:
>> + */
>> +
>> +#ifndef percpu_read
>> +# define percpu_read(var) __get_cpu_var(var)
>> +#endif
>> +
>> +#ifndef percpu_write
>> +# define percpu_write(var, val) ({ __get_cpu_var(var) = (val); })
>> +#endif
>> +
>> +#ifndef percpu_add
>> +# define percpu_add(var, val) ({ __get_cpu_var(var) += (val); })
>> +#endif
>> +
>> +#ifndef percpu_sub
>> +# define percpu_add(var, val) ({ __get_cpu_var(var) += (val); })
>
> this should be:
>
> define percpu_sub(var, val) ({ __get_cpu_var(var) -= (val); })
Thanks. Will fold into the patch.
--
tejun
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