linux-kernel - Re: [patch] add optimized generic percpu accessors

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Date:	Thu, 15 Jan 2009 11:04:17 +0100
From:	"roel kluin" <roel.kluin@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>, "Tejun Heo" <tj@...nel.org>,
	"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

> 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); })

> +#endif
> +
> +#ifndef percpu_or
> +# define percpu_or(var, val)           ({ __get_cpu_var(var) |= (val); })
> +#endif
> +
> +#ifndef percpu_xor
> +# define percpu_xor(var, val)          ({ __get_cpu_var(var) ^= (val); })
> +#endif
> +
>  #endif /* _ASM_GENERIC_PERCPU_H_ */
> --
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