[LTP] [PATCH] hugepages: ensure CONFIG_COMPACTION is defined

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Add check to ensure CONFIG_COMPACTION=y when we need to use hugepages
inside tests. The kernel configuration is used to enable usage of
`/proc/sys/vm/compact_memory` inside the LTP core library.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
The issue was raised by https://github.com/linux-test-project/ltp/pull/1335
that is trying to solve a problem with cachestat03.
---
 lib/tst_hugepage.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/tst_hugepage.c b/lib/tst_hugepage.c
index 40ecfa162a236a8674628f8ffe7a8fd2ccd52712..8fba466b0ebb04d43542d686d6bb9173f1a14cb8 100644
--- a/lib/tst_hugepage.c
+++ b/lib/tst_hugepage.c
@@ -46,6 +46,11 @@ unsigned long tst_reserve_hugepages(struct tst_hugepage *hp)
 		goto set_hugepages;
 	}
 
+	if (access(PATH_VM_COMPACT_MEMORY, F_OK)) {
+		if (hp->policy == TST_NEEDS || hp->policy == TST_REQUEST)
+			tst_brk(TCONF, "CONFIG_COMPACTION not enabled in kernel");
+	}
+
 	SAFE_FILE_PRINTF(PATH_VM_DROP_CACHES, "3");
 	SAFE_FILE_PRINTF(PATH_VM_COMPACT_MEMORY, "1");
 	if (hp->policy == TST_NEEDS) {

---
base-commit: d6fe8d8e7a58c83b6a192fb27cd2ecf5249182f7
change-id: 20260717-fix_tst_test_hugepages-fb3c88e9716c

Best regards,
-- 
Andrea Cervesato <andrea.cervesato@suse.com>