Re: [PATCH v5 05/45] percpu_rwlock: Make percpu-rwlocks IRQ-safe,optimally

[Oleg Nesterov]

only one cosmetic nit...

On 01/22, Srivatsa S. Bhat wrote:
>
> +#define READER_PRESENT		(1UL << 16)
> +#define READER_REFCNT_MASK	(READER_PRESENT - 1)
> +
>  #define reader_uses_percpu_refcnt(pcpu_rwlock, cpu)			\
>  		(ACCESS_ONCE(per_cpu(*((pcpu_rwlock)->reader_refcnt), cpu)))
>
>  #define reader_nested_percpu(pcpu_rwlock)				\
> -			(__this_cpu_read(*((pcpu_rwlock)->reader_refcnt)) > 1)
> +	(__this_cpu_read(*((pcpu_rwlock)->reader_refcnt)) & READER_REFCNT_MASK)
>
>  #define writer_active(pcpu_rwlock)					\
>  			(__this_cpu_read(*((pcpu_rwlock)->writer_signal)))

I think this all can go to lib/percpu-rwlock.c. Nobody needs to know
these implementation details.

Oleg.

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