mm/huge_memory.c: minor lock simplification in __khugepaged_exit

The lock is released first thing in all three branches.  Simplify this by
unconditionally releasing lock and remove else clause which was only there
to be sure lock was released.

Signed-off-by: Chris Wright <[email protected]>
Reviewed-by: Michal Hocko <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

mm/huge_memory.c

@@ -1596,14 +1596,13 @@ void __khugepaged_exit(struct mm_struct *mm)
 		list_del(&mm_slot->mm_node);
 		free = 1;
 	}
+	spin_unlock(&khugepaged_mm_lock);
 
 	if (free) {
-		spin_unlock(&khugepaged_mm_lock);
 		clear_bit(MMF_VM_HUGEPAGE, &mm->flags);
 		free_mm_slot(mm_slot);
 		mmdrop(mm);
 	} else if (mm_slot) {
-		spin_unlock(&khugepaged_mm_lock);
 		/*
 		 * This is required to serialize against
 		 * khugepaged_test_exit() (which is guaranteed to run
@@ -1614,8 +1613,7 @@ void __khugepaged_exit(struct mm_struct *mm)
 		 */
 		down_write(&mm->mmap_sem);
 		up_write(&mm->mmap_sem);
-	} else
-		spin_unlock(&khugepaged_mm_lock);
+	}
 }
 
 static void release_pte_page(struct page *page)