thp: remove khugepaged_loop

Merge khugepaged_loop into khugepaged
Signed-off-by: NXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/huge_memory.c

@@ -2339,14 +2339,6 @@ static void khugepaged_wait_work(void)
 		wait_event_freezable(khugepaged_wait, khugepaged_wait_event());
 }
 
-static void khugepaged_loop(void)
-{
-	while (likely(khugepaged_enabled())) {
-		khugepaged_do_scan();
-		khugepaged_wait_work();
-	}
-}
-
 static int khugepaged(void *none)
 {
 	struct mm_slot *mm_slot;
@@ -2354,8 +2346,10 @@ static int khugepaged(void *none)
 	set_freezable();
 	set_user_nice(current, 19);
 
-	while (!kthread_should_stop())
-		khugepaged_loop();
+	while (!kthread_should_stop()) {
+		khugepaged_do_scan();
+		khugepaged_wait_work();
+	}
 
 	spin_lock(&khugepaged_mm_lock);
 	mm_slot = khugepaged_scan.mm_slot;