[PATCH] sched domain debug sysctl fixes

The following 5 patches provide fixes for the sysctl code added under
CONFIG_DEBUG_SCHED.   After debugging a boot failure dereferencing
not per-cpu data for an impossible cpu, I found the other issues by
inspection.

Following these fixes, /proc/sysctl/kernel/sched_debug/ should work with
exclusive cpusets, cpu hotplug, offline and not present cpus, and will
show all 11 files.

milton
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Follow-Ups:
- Re: [PATCH] sched domain debug sysctl fixes
  - From: Ingo Molnar <[email protected]>
- [PATCH] sched domain debug sysctl fixes
  - From: Milton Miller <[email protected]>
- [PATCH] sched domain sysctl: don't bug on alloc failure
  - From: Milton Miller <[email protected]>
- [PATCH] sched domain sysctl: sysctl tables can have no holes
  - From: Milton Miller <[email protected]>
- [PATCH] sched domain sysctl: register online cpus
  - From: Milton Miller <[email protected]>
- [PATCH] sched.c: use kcalloc
  - From: Milton Miller <[email protected]>
- [PATCH] sched domain sysctl: free and rebuild when changing domains
  - From: Milton Miller <[email protected]>

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