[PATCH -v6 0/5] Shutdown from reboot_cpuid without stopping other cpus.

From: Robin Holt
Date: Wed Apr 24 2013 - 07:19:18 EST

We recently noticed that reboot of a 1024 cpu machine takes approx 16
minutes of just stopping the cpus. The slowdown was tracked to commit

The current implementation does all the work of hot removing the cpus
before halting the system. We are switching to just migrating to the
reboot_cpu and then continuing with shutdown/reboot.

The patch set is broken into five parts. The first two are planned for
the stable release. The others move the halt/shutdown/reboot related
functions to their own kernel/reboot.c file and then introduce the kernel
boot parameter.

Changes since -v5.
- Moved the arch/x86 reboot= up to the generic kernel code.

Changes since -v4.
- Integrated Srivatsa S. Bhat creating cpu_hotplug_disable()

- Integrated comments by Srivatsa S. Bhat.

- Made one more comment consistent with others in function.

Changes since -v3.
- Added a tested-by for the original reporter.

- Fix compile failure found by Joe Perches.

- Integrated comments by Joe Perches.
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