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authorThomas Gleixner <tglx@linutronix.de>2011-09-12 13:32:23 +0200
committerThomas Gleixner <tglx@linutronix.de>2011-09-13 09:58:29 +0200
commit9fb60336253edf73dedc527b2aa2bf32eae0d6da (patch)
tree926cb7ca98eaacea06c8b951ee8b3a1330522c82 /firmware/sun
parente8abccb719377af63cb0f1fed289db405e3def16 (diff)
clocksource: Make watchdog reset lockless
KGDB needs to trylock watchdog_lock when trying to reset the clocksource watchdog after the system has been stopped to avoid a potential deadlock. When the trylock fails TSC usually becomes unstable. We can be more clever by using an atomic counter and checking it in the clocksource_watchdog callback. We restart the watchdog whenever the counter is > 0 and only decrement the counter when we ran through a full update cycle. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <johnstul@us.ibm.com> Acked-by: Jason Wessel <jason.wessel@windriver.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1109121326280.2723@ionos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'firmware/sun')
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