linux-kernel - Re: [PATCH 14/16] percpu: make access macros universal

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Message-ID: <alpine.DEB.1.10.0910141037210.26476@gentwo.org>
Date:	Wed, 14 Oct 2009 10:38:35 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	mingo@...hat.com, tglx@...utronix.de, akpm@...ux-foundation.org,
	rostedt@...dmis.org, hpa@...or.com, cebbert@...hat.com
Subject: Re: [PATCH 14/16] percpu: make access macros universal

On Wed, 14 Oct 2009, Tejun Heo wrote:

> @@ -182,17 +185,19 @@ static inline void *pcpu_lpage_remapped(void *kaddr)
>  #ifndef percpu_read
>  # define percpu_read(var)						\
>    ({									\
> -	typeof(var) __tmp_var__;					\
> -	__tmp_var__ = get_cpu_var(var);					\
> -	put_cpu_var(var);						\
> -	__tmp_var__;							\
> +	typeof(var) *pr_ptr__ = &(var);					\
> +	typeof(var) pr_ret__;						\
> +	pr_ret__ = get_cpu_var(*pr_ptr__);				\
> +	put_cpu_var(*pr_ptr__);						\
> +	pr_ret__;							\
>    })
>  #endif

== this_cpu_read(var) ?

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