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Subject[PATCH for v4.2 2/3] selftests: add membarrier syscall test
Date
From: Pranith Kumar <bobby.prani@gmail.com>

This patch adds a self test for the membarrier system call.

CC: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/membarrier/.gitignore | 1 +
tools/testing/selftests/membarrier/Makefile | 11 +++
.../testing/selftests/membarrier/membarrier_test.c | 71 ++++++++++++++++++++
4 files changed, 84 insertions(+), 0 deletions(-)
create mode 100644 tools/testing/selftests/membarrier/.gitignore
create mode 100644 tools/testing/selftests/membarrier/Makefile
create mode 100644 tools/testing/selftests/membarrier/membarrier_test.c

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 95abddc..73824b1 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -5,6 +5,7 @@ TARGETS += exec
TARGETS += firmware
TARGETS += ftrace
TARGETS += kcmp
+TARGETS += membarrier
TARGETS += memfd
TARGETS += memory-hotplug
TARGETS += mount
diff --git a/tools/testing/selftests/membarrier/.gitignore b/tools/testing/selftests/membarrier/.gitignore
new file mode 100644
index 0000000..020c44f4
--- /dev/null
+++ b/tools/testing/selftests/membarrier/.gitignore
@@ -0,0 +1 @@
+membarrier_test
diff --git a/tools/testing/selftests/membarrier/Makefile b/tools/testing/selftests/membarrier/Makefile
new file mode 100644
index 0000000..877a503
--- /dev/null
+++ b/tools/testing/selftests/membarrier/Makefile
@@ -0,0 +1,11 @@
+CFLAGS += -g -I../../../../usr/include/
+
+all:
+ $(CC) $(CFLAGS) membarrier_test.c -o membarrier_test
+
+TEST_PROGS := membarrier_test
+
+include ../lib.mk
+
+clean:
+ $(RM) membarrier_test
diff --git a/tools/testing/selftests/membarrier/membarrier_test.c b/tools/testing/selftests/membarrier/membarrier_test.c
new file mode 100644
index 0000000..3c9f217
--- /dev/null
+++ b/tools/testing/selftests/membarrier/membarrier_test.c
@@ -0,0 +1,71 @@
+#define _GNU_SOURCE
+#define __EXPORTED_HEADERS__
+
+#include <linux/membarrier.h>
+#include <asm-generic/unistd.h>
+#include <sys/syscall.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include "../kselftest.h"
+
+static int sys_membarrier(int cmd, int flags)
+{
+ return syscall(__NR_membarrier, cmd, flags);
+}
+
+static void test_membarrier_fail(void)
+{
+ int cmd = -1, flags = 0;
+
+ if (sys_membarrier(cmd, flags) != -1) {
+ printf("membarrier: Should fail but passed\n");
+ ksft_exit_fail();
+ }
+}
+
+static void test_membarrier_success(void)
+{
+ int flags = 0;
+
+ if (sys_membarrier(MEMBARRIER_CMD_SHARED, flags) != 0) {
+ printf("membarrier: Executing MEMBARRIER failed, %s\n",
+ strerror(errno));
+ ksft_exit_fail();
+ }
+
+ printf("membarrier: MEMBARRIER_CMD_SHARED success\n");
+}
+
+static void test_membarrier(void)
+{
+ test_membarrier_fail();
+ test_membarrier_success();
+}
+
+static int test_membarrier_exists(void)
+{
+ int flags = 0;
+
+ if (sys_membarrier(MEMBARRIER_CMD_QUERY, flags))
+ return 0;
+
+ return 1;
+}
+
+int main(int argc, char **argv)
+{
+ printf("membarrier: MEMBARRIER_CMD_QUERY ");
+ if (test_membarrier_exists()) {
+ printf("syscall implemented\n");
+ test_membarrier();
+ } else {
+ printf("syscall not implemented!\n");
+ return ksft_exit_fail();
+ }
+
+ printf("membarrier: tests done!\n");
+
+ return ksft_exit_pass();
+}
--
1.7.7.3


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