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Sebastien Dugue 94df7de028 hrtimers: allow the hot-unplugging of all cpus

Impact: fix CPU hotplug hang on Power6 testbox

On architectures that support offlining all cpus (at least powerpc/pseries),
hot-unpluging the tick_do_timer_cpu can result in a system hang.

This comes from the fact that if the cpu going down happens to be the
cpu doing the tick, then as the tick_do_timer_cpu handover happens after the
cpu is dead (via the CPU_DEAD notification), we're left without ticks,
jiffies are frozen and any task relying on timers (msleep, ...) is stuck.
That's particularly the case for the cpu looping in __cpu_die() waiting
for the dying cpu to be dead.

This patch addresses this by having the tick_do_timer_cpu handover happen
earlier during the CPU_DYING notification. For this, a new clockevent
notification type is introduced (CLOCK_EVT_NOTIFY_CPU_DYING) which is triggered
in hrtimer_cpu_notify().

Signed-off-by: Sebastien Dugue <[email protected]>
Cc: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

2009-01-30 22:35:29 +01:00

clockevents.c

cpumask: convert struct clock_event_device to cpumask pointers.

2008-12-13 21:20:26 +10:30

clocksource.c

cpumask: replace for_each_cpu_mask_nr with for_each_cpu in kernel/time/

2009-01-01 10:12:29 +10:30

jiffies.c

trivial: fix then -> than typos in comments and documentation

2009-01-06 11:28:06 +01:00

Kconfig

Kconfig: eliminate "def_bool n" constructs