Re: [patch] add optimized generic percpu accessors

[roel kluin]

> 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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