[PATCH v2] ARM: SMP_TWD: make setup()/stop() reentrant

[Shawn Guo]

On Mon, Oct 22, 2012 at 12:14:03PM +0200, Linus Walleij wrote:
> > 2. When secondary cores get off-line, the clockevent devices for
> >    the cores will be released.  So when they become online, the
> >    clockevent devices should be registered again.
> 
> So that is how it happens. Where is the code releasing all
> clock events? I was thinking this would more properly be done
> in the .stop() path of the SMP TWD driver?
> 
tick_notify() will receive CLOCK_EVT_NOTIFY_CPU_DEAD when a cpu goes
away.  It results in tick_shutdown() invoking which will release the
clockevent device for the cpu.

Shawn