[LTP] [PATCH] mem.c: check whether MADV_MERGEABLE is available

[DAN LI <li.dan@cn.fujitsu.com>]

Before using MADV_MERGEABLE, check whether it's available by macro
HAVE_MADV_MERGEABLE.

Signed-off-by: DAN LI <li.dan@cn.fujitsu.com>
---
 testcases/kernel/mem/lib/mem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/testcases/kernel/mem/lib/mem.c b/testcases/kernel/mem/lib/mem.c
index 7cda3c5..9bc926e 100644
--- a/testcases/kernel/mem/lib/mem.c
+++ b/testcases/kernel/mem/lib/mem.c
@@ -494,8 +494,10 @@ void test_ksm_merge_across_nodes(unsigned long nr_pages)
 			    MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
 		if (memory[i] == MAP_FAILED)
 			tst_brkm(TBROK|TERRNO, tst_exit, "mmap");
+#ifdef HAVE_MADV_MERGEABLE
 		if (madvise(memory[i], length, MADV_MERGEABLE) == -1)
 			tst_brkm(TBROK|TERRNO, tst_exit, "madvise");
+#endif

 #if HAVE_NUMA_H && HAVE_LINUX_MEMPOLICY_H && HAVE_NUMAIF_H \
 	&& HAVE_MPOL_CONSTANTS
-- 
1.7.11.rc0

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