From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Date: Fri, 7 Sep 2012 00:23:38 +0000 (+1000)
Subject: thp: remove unnecessary khugepaged_thread check
X-Git-Tag: next-20120907~1^2~153
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ad2186268615f27d122dc85f7465853c2f4cdf76;p=karo-tx-linux.git

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>
---

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 4d0b2d7fe79d..62f1784f03fa 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2334,11 +2334,8 @@ 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;