Dynamic allocation of cpumasks requires the size.

Signed-off-by: Mike Travis <travis@sgi.com>
---
 include/linux/cpumask.h |    3 +++
 1 file changed, 3 insertions(+)

--- linux-2.6.28.orig/include/linux/cpumask.h
+++ linux-2.6.28/include/linux/cpumask.h
@@ -64,6 +64,7 @@
  * int next_cpu(cpu, mask)		Next cpu past 'cpu', or NR_CPUS
  * int next_cpu_nr(cpu, mask)		Next cpu past 'cpu', or nr_cpu_ids
  *
+ * size_t cpumask_size()		Length of cpumask in bytes.
  * cpumask_t cpumask_of_cpu(cpu)	Return cpumask with bit 'cpu' set
  *					(can be used as an lvalue)
  * CPU_MASK_ALL				Initializer - all bits set
@@ -147,6 +148,8 @@ struct cpumask {
 };
 #define cpumask_bits(maskp) ((maskp)->bits)
 
+#define cpumask_size() (BITS_TO_LONGS(NR_CPUS) * sizeof(long))
+
 /* Deprecated. */
 typedef struct cpumask cpumask_t;
 extern cpumask_t _unused_cpumask_arg_;

-- 
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