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Date: Sun, 31 Aug 2008 10:28:14 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: tony.luck@...el.com, jes@....com, manfred@...orfullife.com, akpm@...ux-foundation.org Subject: [PATCH] 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. Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> --- smpboot.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c index bcea81e..7a90f42 100644 --- a/arch/ia64/kernel/smpboot.c +++ b/arch/ia64/kernel/smpboot.c @@ -741,8 +741,6 @@ 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); @@ -751,6 +749,7 @@ int __cpu_disable(void) 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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