This allows to change them at runtime using sysfs. No need to
reboot to set them.

I only added aliases (kernel.noirqdebug etc.) so the old options
still work.
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>