cpumask: only allocate nr_cpumask_bits.

Now we'll find out the hard way if anyone has CPUMASK_OFFSTACK and is
returning these or assigning them.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 2 insertions, 3 deletions

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 646fadee5caf..4ad2d3c8e21f 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -11,6 +11,7 @@
 #include <linux/bitmap.h>
 #include <linux/bug.h>
 
+/* Don't assign or return these: may not be this big! */
 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
 
 /**
@@ -609,9 +610,7 @@ static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
  */
 static inline size_t cpumask_size(void)
 {
-        /* FIXME: Once all cpumask assignments are eliminated, this
-         * can be nr_cpumask_bits */
-        return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
+        return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long);
 }
 
 /*