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sched: Use clamp() and clamp_val() to make sys_nice() more readable 

Suggested-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1399541715-19568-1-git-send-email-yangds.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Dongsheng Yang 2014-05-08 18:35:15 +09:00 committed by Ingo Molnar
parent caffcdd8d2
commit a9467fa3cd
1 changed files with 2 additions and 9 deletions
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11
kernel/sched/core.c
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@ -3057,17 +3057,10 @@ SYSCALL_DEFINE1(nice, int, increment)
* We don't have to worry. Conceptually one call occurs first
* and we have a single winner.
*/
if (increment < -40)
increment = -40;
if (increment > 40)
increment = 40;
increment = clamp(increment, -NICE_WIDTH, NICE_WIDTH);
nice = task_nice(current) + increment;
if (nice < MIN_NICE)
nice = MIN_NICE;
if (nice > MAX_NICE)
nice = MAX_NICE;
nice = clamp_val(nice, MIN_NICE, MAX_NICE);
if (increment < 0 && !can_nice(current, nice))
return -EPERM;