sched/fair: Move init_numa_balancing() below task_numa_work()

To reference task_numa_work() from within init_numa_balancing(), we
need the former to be declared before the latter. Do just that.

This is a pure code movement.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: mgorman@suse.de
Cc: riel@surriel.com
Link: https://lkml.kernel.org/r/20190715102508.32434-2-valentin.schneider@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index bc9cfea..f0c4880 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1188,47 +1188,6 @@ static unsigned int task_scan_max(struct task_struct *p)
        return max(smin, smax);
 }
 
-void init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
-{
-       int mm_users = 0;
-       struct mm_struct *mm = p->mm;
-
-       if (mm) {
-               mm_users = atomic_read(&mm->mm_users);
-               if (mm_users == 1) {
-                       mm->numa_next_scan = jiffies + msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
-                       mm->numa_scan_seq = 0;
-               }
-       }
-       p->node_stamp                   = 0;
-       p->numa_scan_seq                = mm ? mm->numa_scan_seq : 0;
-       p->numa_scan_period             = sysctl_numa_balancing_scan_delay;
-       p->numa_work.next               = &p->numa_work;
-       p->numa_faults                  = NULL;
-       RCU_INIT_POINTER(p->numa_group, NULL);
-       p->last_task_numa_placement     = 0;
-       p->last_sum_exec_runtime        = 0;
-
-       /* New address space, reset the preferred nid */
-       if (!(clone_flags & CLONE_VM)) {
-               p->numa_preferred_nid = NUMA_NO_NODE;
-               return;
-       }
-
-       /*
-        * New thread, keep existing numa_preferred_nid which should be copied
-        * already by arch_dup_task_struct but stagger when scans start.
-        */
-       if (mm) {
-               unsigned int delay;
-
-               delay = min_t(unsigned int, task_scan_max(current),
-                       current->numa_scan_period * mm_users * NSEC_PER_MSEC);
-               delay += 2 * TICK_NSEC;
-               p->node_stamp = delay;
-       }
-}
-
 static void account_numa_enqueue(struct rq *rq, struct task_struct *p)
 {
        rq->nr_numa_running += (p->numa_preferred_nid != NUMA_NO_NODE);
@@ -2665,6 +2624,47 @@ out:
        }
 }
 
+void init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
+{
+       int mm_users = 0;
+       struct mm_struct *mm = p->mm;
+
+       if (mm) {
+               mm_users = atomic_read(&mm->mm_users);
+               if (mm_users == 1) {
+                       mm->numa_next_scan = jiffies + msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
+                       mm->numa_scan_seq = 0;
+               }
+       }
+       p->node_stamp                   = 0;
+       p->numa_scan_seq                = mm ? mm->numa_scan_seq : 0;
+       p->numa_scan_period             = sysctl_numa_balancing_scan_delay;
+       p->numa_work.next               = &p->numa_work;
+       p->numa_faults                  = NULL;
+       RCU_INIT_POINTER(p->numa_group, NULL);
+       p->last_task_numa_placement     = 0;
+       p->last_sum_exec_runtime        = 0;
+
+       /* New address space, reset the preferred nid */
+       if (!(clone_flags & CLONE_VM)) {
+               p->numa_preferred_nid = NUMA_NO_NODE;
+               return;
+       }
+
+       /*
+        * New thread, keep existing numa_preferred_nid which should be copied
+        * already by arch_dup_task_struct but stagger when scans start.
+        */
+       if (mm) {
+               unsigned int delay;
+
+               delay = min_t(unsigned int, task_scan_max(current),
+                       current->numa_scan_period * mm_users * NSEC_PER_MSEC);
+               delay += 2 * TICK_NSEC;
+               p->node_stamp = delay;
+       }
+}
+
 /*
  * Drive the periodic memory faults..
  */