sched/prio: Add 3 macros of MAX_NICE, MIN_NICE and NICE_WIDTH in prio.h
Currently there is lots of hard coding to 19 and -20, to represent maximum and minimum of nice values. This patch add three macros in prio.h for maximum, minimum and width of nice value, and uses it to remove hardcoded values in prio.h. Signed-off-by: NDongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/3994e89327b2b15f992277cdf9f409c516f87d1b.1392103744.git.yangds.fnst@cn.fujitsu.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de> [ Collapsed two small patches. ] Signed-off-by: NIngo Molnar <mingo@kernel.org>
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