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[PATCH] powerpc: avoid timer interrupt replay effect when onlining cpu 

When a cpu is hotplug-onlined, if we don't set per_cpu(last_jiffy) to
something sane, timer_interrupt will execute its while loop for every
tick missed since the cpu was last online (or since the system was
booted, if we're adding a new cpu).  This can cause weird hangs, ssh
sessions dropping, and we can even go xmon if we take a global IPI at
the wrong time.

Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Nathan Lynch 2006-02-06 22:44:23 -06:00 committed by Paul Mackerras
parent 4dc4325693
commit 7d4d61544a
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/kernel/smp.c
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@ -540,6 +540,9 @@ int __devinit start_secondary(void *unused)
if (smp_ops->take_timebase)
smp_ops->take_timebase();
if (system_state > SYSTEM_BOOTING)
per_cpu(last_jiffy, cpu) = get_tb();
spin_lock(&call_lock);
cpu_set(cpu, cpu_online_map);
spin_unlock(&call_lock);