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sparc64: Prevent sparc64 from invoking irq handlers on offline CPUs

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Make sparc64 refrain from clearing a given to-be-offlined CPU's bit in the
cpu_online_mask until it has processed pending irqs.  This change
prevents other CPUs from being blindsided by an apparently offline CPU
nevertheless changing globally visible state.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul E. McKenney 2008-09-03 02:15:30 -07:00 committed by David S. Miller
parent e5bd1c3fdd
commit 4d084617fb
1 changed files with 4 additions and 4 deletions
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8
arch/sparc64/kernel/smp.c
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@ -1303,10 +1303,6 @@ int __cpu_disable(void)
c->core_id = 0;
c->proc_id = -1;
ipi_call_lock();
cpu_clear(cpu, cpu_online_map);
ipi_call_unlock();
smp_wmb();
/* Make sure no interrupts point to this cpu. */
@ -1316,6 +1312,10 @@ int __cpu_disable(void)
mdelay(1);
local_irq_disable();
ipi_call_lock();
cpu_clear(cpu, cpu_online_map);
ipi_call_unlock();
return 0;
}