handling watchdog in SMP

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I was hoping to get some ideas on how to handle the watchdog timers we have on some embedded PPC (booke_wdt.c) cores when we are in a SMP system.

The problem is since the watchdog is part of the processor core depending on which processor a given system call is executed at we might get different behavior. It seems like we would want to mirror the actions to both cores (via smp_call_function).

Looking at the file ops we currently support in booke_wdt.c it seems like we could mirror the actions for booke_wdt_write()/booke_wdt_ping () to both cores and ensure when we set something like WDIOC_SETTIMEOUT we set the registers in both processors.

I was wondering if anyone had any other ideas or if this model seems to work.

- k
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