sched_rt: don't allocate cpumask in fastpath

Impact: cleanup

As pointed out by Steven Rostedt.  Since the arg in question is
unused, we simply change cpupri_find() to accept NULL.

Reported-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <200903251501.22664.rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 7 insertions, 13 deletions

diff --git a/kernel/sched_cpupri.c b/kernel/sched_cpupri.c
index 1e00bfacf9b8..cdd3c89574cd 100644
--- a/kernel/sched_cpupri.c
+++ b/kernel/sched_cpupri.c
@@ -55,7 +55,7 @@ static int convert_prio(int prio)
  * cpupri_find - find the best (lowest-pri) CPU in the system
  * @cp: The cpupri context
  * @p: The task
- * @lowest_mask: A mask to fill in with selected CPUs
+ * @lowest_mask: A mask to fill in with selected CPUs (or NULL)
  *
  * Note: This function returns the recommended CPUs as calculated during the
  * current invokation.  By the time the call returns, the CPUs may have in
@@ -81,7 +81,8 @@ int cpupri_find(struct cpupri *cp, struct task_struct *p,
                 if (cpumask_any_and(&p->cpus_allowed, vec->mask) >= nr_cpu_ids)
                         continue;
 
-                cpumask_and(lowest_mask, &p->cpus_allowed, vec->mask);
+                if (lowest_mask)
+                        cpumask_and(lowest_mask, &p->cpus_allowed, vec->mask);
                 return 1;
         }
 
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index bac1061cea2f..fbec5a58ff10 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -805,20 +805,15 @@ static int select_task_rq_rt(struct task_struct *p, int sync)
 
 static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
 {
-        cpumask_var_t mask;
-
         if (rq->curr->rt.nr_cpus_allowed == 1)
                 return;
 
-        if (!alloc_cpumask_var(&mask, GFP_ATOMIC))
-                return;
-
         if (p->rt.nr_cpus_allowed != 1
-            && cpupri_find(&rq->rd->cpupri, p, mask))
-                goto free;
+            && cpupri_find(&rq->rd->cpupri, p, NULL))
+                return;
 
-        if (!cpupri_find(&rq->rd->cpupri, rq->curr, mask))
-                goto free;
+        if (!cpupri_find(&rq->rd->cpupri, rq->curr, NULL))
+                return;
 
         /*
          * There appears to be other cpus that can accept
@@ -827,8 +822,6 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
          */
         requeue_task_rt(rq, p, 1);
         resched_task(rq->curr);
-free:
-        free_cpumask_var(mask);
 }
 
 #endif /* CONFIG_SMP */