thp: remove unnecessary khugepaged_thread check

Now, khugepaged creation and cancel are completely serial under the
protection of khugepaged_mutex, it is impossible that many khugepaged
entities are running

Signed-off-by: Xiao 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0931b2b..46e3f15 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2333,11 +2333,8 @@ static int khugepaged(void *none)
        set_freezable();
        set_user_nice(current, 19);
 
-       while (!kthread_should_stop()) {
-               VM_BUG_ON(khugepaged_thread != current);
+       while (!kthread_should_stop())
                khugepaged_loop();
-               VM_BUG_ON(khugepaged_thread != current);
-       }
 
        spin_lock(&khugepaged_mm_lock);
        mm_slot = khugepaged_scan.mm_slot;