linux-kernel - [PATCH 06/12] thp: remove some code depend on CONFIG

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Date:	Mon, 13 Aug 2012 19:15:11 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: [PATCH 06/12] thp: remove some code depend on CONFIG_NUMA

If NUMA is disabled, hpage is used as page pre-alloc, so there are
two cases for hpage:
- it is !NULL, means the page is not consumed otherwise,
- the page has been consumed

If NUMA is enabled, hpage is just used as alloc-fail indicator which
is not a real page, NULL means not fail triggered.

So, we can release the page only if !IS_ERR_OR_NULL

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 mm/huge_memory.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 86f71af..5f620cf 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2321,11 +2321,8 @@ static void khugepaged_wait_work(void)

 static void khugepaged_loop(void)
 {
-	struct page *hpage;
+	struct page *hpage = NULL;

-#ifdef CONFIG_NUMA
-	hpage = NULL;
-#endif
 	while (likely(khugepaged_enabled())) {
 #ifndef CONFIG_NUMA
 		hpage = khugepaged_alloc_hugepage();
@@ -2339,10 +2336,9 @@ static void khugepaged_loop(void)
 #endif

 		khugepaged_do_scan(&hpage);
-#ifndef CONFIG_NUMA
-		if (hpage)
+
+		if (!IS_ERR_OR_NULL(hpage))
 			put_page(hpage);
-#endif

 		khugepaged_wait_work();
 	}
-- 
1.7.7.6

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