Re: [PATCH 01/15] sched/prio: Add a macro named NICE_TO_RLIMIT in prio.h.

From: Heiko Carstens
Date: Tue Mar 11 2014 - 04:17:48 EST


On Tue, Mar 11, 2014 at 12:59:16PM +0800, Dongsheng Yang wrote:
> This patch add a macro named NICE_TO_RLIMIT in prio.h to
> convert nice value [19,-20] to rlimit style value [1,40].
>
> Signed-off-by: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx>
> ---
> include/linux/sched/prio.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/sched/prio.h b/include/linux/sched/prio.h
> index ac32258..8e78c47 100644
> --- a/include/linux/sched/prio.h
> +++ b/include/linux/sched/prio.h
> @@ -41,4 +41,9 @@
> #define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio)
> #define MAX_USER_PRIO (USER_PRIO(MAX_PRIO))
>
> +/*
> + * Convert nice value [19,-20] to rlimit style value [1,40].
> + */
> +#define NICE_TO_RLIMIT(nice) (MAX_NICE - nice + 1)

Where is MAX_NICE defined? The s390 patch fails to compile.

Also you probably want at least extra braces around the 'nice' usage to
avoid subtle side effects. (or make NICE_TO.. a function, whatever).

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/