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[IA64] prevent ia64 from invoking irq handlers on offline CPUs 

Make ia64 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.  Also remove the existing
redundant cpu_clear(cpu, cpu_online_map).

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Paul E. McKenney 2008-08-31 11:06:30 -07:00 committed by Tony Luck
parent 6bf6a1a493
commit e7b140365b
1 changed files with 1 additions and 3 deletions
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4
arch/ia64/kernel/smpboot.c
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@ -741,16 +741,14 @@ int __cpu_disable(void)
return -EBUSY;
}
cpu_clear(cpu, cpu_online_map);
if (migrate_platform_irqs(cpu)) {
cpu_set(cpu, cpu_online_map);
return (-EBUSY);
}
remove_siblinginfo(cpu);
cpu_clear(cpu, cpu_online_map);
fixup_irqs();
cpu_clear(cpu, cpu_online_map);
local_flush_tlb_all();
cpu_clear(cpu, cpu_callin_map);
return 0;