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, 3 insertions, 2 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index ccc23a9cd264..1a8252385c4d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4908,9 +4908,10 @@ out_unlock:
         return retval;
 }
 
-long sched_setaffinity(pid_t pid, cpumask_t new_mask)
+long sched_setaffinity(pid_t pid, const cpumask_t *in_mask)
 {
         cpumask_t cpus_allowed;
+        cpumask_t new_mask = *in_mask;
         struct task_struct *p;
         int retval;
 
@@ -4991,7 +4992,7 @@ asmlinkage long sys_sched_setaffinity(pid_t pid, unsigned int len,
         if (retval)
                 return retval;
 
-        return sched_setaffinity(pid, new_mask);
+        return sched_setaffinity(pid, &new_mask);
 }
 
 /*