generic: reduce stack pressure in sched_affinity

  * Modify sched_affinity functions to pass cpumask_t variables by reference
    instead of by value.

  * Use new set_cpus_allowed_ptr function.

Depends on:
	[sched-devel]: sched: add new set_cpus_allowed_ptr function

Cc: Paul Jackson <pj@sgi.com>
Cc: Cliff Wickman <cpw@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index e9517014b57c..e1cdf196a515 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -1007,10 +1007,10 @@ void __synchronize_sched(void)
         if (sched_getaffinity(0, &oldmask) < 0)
                 oldmask = cpu_possible_map;
         for_each_online_cpu(cpu) {
-                sched_setaffinity(0, cpumask_of_cpu(cpu));
+                sched_setaffinity(0, &cpumask_of_cpu(cpu));
                 schedule();
         }
-        sched_setaffinity(0, oldmask);
+        sched_setaffinity(0, &oldmask);
 }
 EXPORT_SYMBOL_GPL(__synchronize_sched);