usage of disarm_decr[]

[Paul Mackerras]

Xiaogeng (Shawn) Jin writes:

> What's the purpose of using disarm_decr? I read the timer_interrupt()
> code and found the only place where it's referenced.

RT-Linux (www.fsmlabs.com) uses it.  RT-Linux takes over all interrupt
handling, including decrementer interrupts, and the disarm_decr thing
is there to give RT-Linux a way to take control of the decrementer
register.

Paul.

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