From: Avi Kivity <[email protected]>

Signed-off-by: Avi Kivity <[email protected]>

diff --git a/external-module-compat-comm.h b/external-module-compat-comm.h
index dad43ef..cc28e86 100644
--- a/external-module-compat-comm.h
+++ b/external-module-compat-comm.h
@@ -728,6 +728,21 @@ static inline void cpumask_clear_cpu(int cpu, 
cpumask_var_t mask)
 
 #endif
 
+/* A zeroing constructor was added late 2.6.30 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
+
+static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
+{
+       bool ret;
+
+       ret = alloc_cpumask_var(mask, flags);
+       if (ret)
+               cpumask_clear(*mask);
+       return ret;
+}
+
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
 
 #define IF_ANON_INODES_DOES_REFCOUNTS(x)
--
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