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authorXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>2012-10-08 16:29:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:26 +0900
commit9817626e722a5e5699cf38f5d3a4c9851e054436 (patch)
treef8826ef7cf4182a963350d421991f2f3b26a30d9 /mm
parent2017c0bff8ba79ea527361adbe19471e174775d6 (diff)
downloadlinux-9817626e722a5e5699cf38f5d3a4c9851e054436.tar.gz
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@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>
Diffstat (limited to 'mm')
-rw-r--r--mm/huge_memory.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a94c07a1b3c5..1e21b4cf4c75 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2306,11 +2306,8 @@ 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();
@@ -2324,10 +2321,9 @@ 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();
 	}