linux-kernel - [PATCH 1/3] thp: fix forgetting to reset the page alloc indicator

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Date:	Wed, 12 Sep 2012 20:56:06 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] thp: fix forgetting to reset the page alloc indicator

If NUMA is enabled, the indicator is not reset if the previous page
request is failed, then it will trigger the VM_BUG_ON in khugepaged_alloc_page

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 mm/huge_memory.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e366ca5..66d2bc6 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1825,6 +1825,7 @@ static bool khugepaged_prealloc_page(struct page **hpage, bool *wait)
 			return false;

 		*wait = false;
+		*hpage = NULL;
 		khugepaged_alloc_sleep();
 	} else if (*hpage) {
 		put_page(*hpage);
-- 
1.7.7.6

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