[PATCH] smp:Fix use un-initialized cpumask_ipi

[Wang YanQing]

c7b798525b50256c8084215a139fa40b0114bfcc
[smp: Fix SMP function call empty cpu mask race]
use the un-initialized variable cpumask_ipi when
enable CONFIG_CPUMASK_OFFSTACK.

Signed-off-by: Wang YanQing <udknight@xxxxxxxxx>
---
 I am sorry for miss it, I just think it when I 
 was lying on the bed last night. :)

 kernel/smp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/smp.c b/kernel/smp.c
index 7c56aba..a38aa18 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -57,6 +57,9 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
 		if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
 				cpu_to_node(cpu)))
 			return notifier_from_errno(-ENOMEM);
+		if (!zalloc_cpumask_var_node(&cfd->cpumask_ipi, GFP_KERNEL,
+				cpu_to_node(cpu)))
+			return notifier_from_errno(-ENOMEM);
 		break;
 
 #ifdef CONFIG_HOTPLUG_CPU
-- 
1.7.11.1.116.g8228a23
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