[LTP] [PATCH] syscalls/shmget02: Handle missing hugepage support in HW

[Martin Doucha]

When hugepage support is enabled in kernel but hardware support is missing,
the last two test cases in shmget02 will fail because kernel will return
ENOENT. Check hardware support and update expected errnos accordingly.

Signed-off-by: Martin Doucha <mdoucha@suse.cz>
---
 .../kernel/syscalls/ipc/shmget/shmget02.c     | 33 +++++++++++++------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/testcases/kernel/syscalls/ipc/shmget/shmget02.c b/testcases/kernel/syscalls/ipc/shmget/shmget02.c
index effd33799..165a34456 100644
--- a/testcases/kernel/syscalls/ipc/shmget/shmget02.c
+++ b/testcases/kernel/syscalls/ipc/shmget/shmget02.c
@@ -63,15 +63,27 @@ static struct tcase {
 	{&shmkey1, SHM_SIZE, IPC_CREAT | SHM_HUGETLB, 0, 0, ENOMEM}
 };
 
-static int hugetlbfs_supported(void)
+static int get_hugetlb_exp_error(void)
 {
+	long tmp;
 	struct tst_kconfig_var kconfig = {
 		.id = CONFIG_HUGETLBFS,
 		.id_len = sizeof(CONFIG_HUGETLBFS)-1,
 	};
 
 	tst_kconfig_read(&kconfig, 1);
-	return kconfig.choice == 'y';
+
+	if (kconfig.choice != 'y') {
+		tst_res(TINFO, "SHM_HUGETLB not supported by kernel");
+		return EINVAL;
+	}
+
+	if (FILE_LINES_SCANF("/proc/meminfo", "Hugepagesize: %ld", &tmp)) {
+		tst_res(TINFO, "Huge pages not supported by hardware");
+		return ENOENT;
+	}
+
+	return 0;
 }
 
 static void do_test(unsigned int n)
@@ -102,22 +114,23 @@ static void do_test(unsigned int n)
 static void setup(void)
 {
 	struct rlimit rl = { 0, 0 };
+	int hugetlb_errno;
+	unsigned int i;
+
 	shmkey = GETIPCKEY();
 	shmkey1 = GETIPCKEY();
 
 	SAFE_SETRLIMIT(RLIMIT_MEMLOCK, &rl);
 	shm_id = SAFE_SHMGET(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL);
 	pw = SAFE_GETPWNAM("nobody");
+	hugetlb_errno = get_hugetlb_exp_error();
 
-	if (!hugetlbfs_supported()) {
-		unsigned int i;
-
-		tst_res(TINFO, "SHM_HUGETLB not supported by kernel");
+	if (!hugetlb_errno)
+		return;
 
-		for (i = 0; i < ARRAY_SIZE(tcases); i++) {
-			if (tcases[i].flags & SHM_HUGETLB)
-				tcases[i].exp_err = EINVAL;
-		}
+	for (i = 0; i < ARRAY_SIZE(tcases); i++) {
+		if (tcases[i].flags & SHM_HUGETLB)
+			tcases[i].exp_err = hugetlb_errno;
 	}
 }
 
-- 
2.33.0