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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2008-08-31 11:06:30 -0700
committerTony Luck <tony.luck@intel.com>2008-09-10 10:52:42 -0700
commite7b140365b86aaf94374214c6f4e6decbee2eb0a (patch)
tree6467805ada12be5cd1d5136869bf1f031f441999 /arch/ia64/kernel/smpboot.c
parent6bf6a1a49377c32a02939ec835553703994f3e41 (diff)
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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>
Diffstat (limited to 'arch/ia64/kernel/smpboot.c')
-rw-r--r--arch/ia64/kernel/smpboot.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index bcea81e432f..d8f05e504fb 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -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;