[LTP] [PATCH v2 12/13] Hugetlb: Migrating libhugetlbfs shm-fork

[Tarun Sahu]

Migrating the libhugetlbfs/testcases/shm-fork.c test

Test Description: Test shared memory behavior when multiple threads are
Test shared memory behavior when multiple threads are attached
to a segment.  A segment is created and then children are
spawned which attach, write, read (verify), and detach from the
shared memory segment.

Signed-off-by: Tarun Sahu <tsahu@linux.ibm.com>
---
 runtest/hugetlb                               |  1 +
 testcases/kernel/mem/.gitignore               |  1 +
 .../kernel/mem/hugetlb/hugefork/hugefork02.c  | 90 +++++++++++++++++++
 3 files changed, 92 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugefork/hugefork02.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 33fd384b4..6d63fec5d 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -2,6 +2,7 @@ hugefallocate01 hugefallocate01
 hugefallocate02 hugefallocate02
 
 hugefork01 hugefork01
+hugefork02 hugefork02
 
 hugemmap01 hugemmap01
 hugemmap02 hugemmap02
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index 8375389cd..0c1311303 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -2,6 +2,7 @@
 /hugetlb/hugefallocate/hugefallocate01
 /hugetlb/hugefallocate/hugefallocate02
 /hugetlb/hugefork/hugefork01
+/hugetlb/hugefork/hugefork02
 /hugetlb/hugemmap/hugemmap01
 /hugetlb/hugemmap/hugemmap02
 /hugetlb/hugemmap/hugemmap04
diff --git a/testcases/kernel/mem/hugetlb/hugefork/hugefork02.c b/testcases/kernel/mem/hugetlb/hugefork/hugefork02.c
new file mode 100644
index 000000000..e356a256f
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugefork/hugefork02.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.
+ * Author: David Gibson & Adam Litke
+ */
+
+/*\
+ * [Description]
+ *
+ * Test shared memory behavior when multiple threads are attached to a
+ * segment. A segment is created and then children are spawned which
+ * attach, write, read (verify), and detach from the shared memory segment.
+ */
+
+#include "tst_safe_sysv_ipc.h"
+#include "hugetlb.h"
+
+static int shmid = -1;
+
+#define NR_HUGEPAGES 5
+#define NUMPROCS MIN(50L, tst_ncpus_available())
+#define MNTPOINT "hugetlbfs/"
+
+static long hpage_size;
+
+static void do_child(int thread, unsigned long size)
+{
+	volatile char *shmaddr;
+	int j;
+	unsigned long k;
+
+	for (j = 0; j < 5; j++) {
+		shmaddr = SAFE_SHMAT(shmid, 0, SHM_RND);
+
+		for (k = 0; k < size; k++)
+			shmaddr[k] = (char) (k);
+		for (k = 0; k < size; k++)
+			if (shmaddr[k] != (char)k) {
+				tst_res(TFAIL, "Thread %d, Offset %lu mismatch", thread, k);
+				goto cleanup;
+			}
+
+		SAFE_SHMDT((const void *)shmaddr);
+	}
+cleanup:
+	exit(0);
+}
+
+static void run_test(void)
+{
+	unsigned long size;
+	int pid;
+	int i;
+
+	size = hpage_size * NR_HUGEPAGES;
+	shmid = SAFE_SHMGET(2, size, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W);
+
+	for (i = 0; i < NUMPROCS; i++) {
+		pid = SAFE_FORK();
+
+		if (pid == 0)
+			do_child(i, size);
+	}
+
+	tst_reap_children();
+	tst_res(TPASS, "Successfully tested shared hugetlb memory with multiple procs");
+}
+
+static void setup(void)
+{
+	hpage_size = tst_get_hugepage_size();
+}
+
+static void cleanup(void)
+{
+	if (shmid >= 0)
+		SAFE_SHMCTL(shmid, IPC_RMID, NULL);
+}
+
+static struct tst_test test = {
+	.needs_root = 1,
+	.mntpoint = MNTPOINT,
+	.needs_hugetlbfs = 1,
+	.needs_tmpdir = 1,
+	.forks_child = 1,
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.hugepages = {NR_HUGEPAGES, TST_NEEDS},
+};
-- 
2.31.1