High resolution timer / dynamic tick update

This is a full replacement queue for the high resolution timer / dynamic ticks implemementation in -mm.

This version includes the following improvements:

- Seperate clockevents management of devices and users

- Provide a generic tick managament infrastructure, which makes use of the clock events management layer. This provides:

- periodic tick management
- broadcast management (e.g. to solve the APIC stops in C3 power state problem)
- dynamic tick core functionality
- high resolution timer core infrastructure

This allows to provide dynamic ticks with low and high resolution timers by sharing the infrastructure. [read: CONFIG_NO_HZ=y is now available without CONFIG_HIGH_RES_TIMERS as well.]

( The dynamic tick implementation also contains a fix for the
generic next_timer_interrupt() function, which did not do the cascade lookups correctly. )

- Provide a generic way to verify clocksources. TSC needs verification due to broken hardware and BIOS implementations. The previous attempt to allow TSC usage for high resolution and/or dynamic ticks only in combination with the PM-Timer made hardwired assumptions, which are ugly to maintain. The new verification code solves this by chosing the best available clocksource for verification and handles the usability check for highres / dynamic ticks. This makes TSC code agnostic of other hardware available in the system.

- Removed the dynamic tick specific parts from the high resolution timer code.

- Dynamic ticks and high resolution timers can be disabled separately at compile time or at run time from the kernel command line.

Thomas, Ingo

P.S:
Sorry for the resend. Did not notice my list typo. :(

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