sched/rt: Avoid obvious configuration fail
authorPeter Zijlstra <peterz@infradead.org>
Mon, 9 Feb 2015 11:23:20 +0000 (12:23 +0100)
committerIngo Molnar <mingo@kernel.org>
Wed, 18 Feb 2015 15:17:23 +0000 (16:17 +0100)
commit2636ed5f8d15ff9395731593537b4b3fdf2af24d
tree3e124314e5694fdd6a4b611a054ffe5112a92934
parent1fe89e1b6d270aa0d3452c60d38461ea589594e3
sched/rt: Avoid obvious configuration fail

Setting the root group's cpu.rt_runtime_us to 0 is a bad thing; it
would disallow the kernel creating RT tasks.

One can of course still set it to 1, which will (likely) still wreck
your kernel, but at least make it clear that setting it to 0 is not
good.

Collect both sanity checks into the one place while we're there.

Suggested-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20150209112715.GO24151@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/sched/core.c