[PATCH for 4.16 06/11] membarrier: selftest: Test shared expedited cmd

[Mathieu Desnoyers]

Test the new MEMBARRIER_CMD_SHARED_EXPEDITED and
MEMBARRIER_CMD_REGISTER_SHARED_EXPEDITED commands.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
Acked-by: Shuah Khan <shua...@osg.samsung.com>
CC: Greg Kroah-Hartman <gre...@linuxfoundation.org>
CC: Peter Zijlstra <pet...@infradead.org>
CC: Paul E. McKenney <paul...@linux.vnet.ibm.com>
CC: Boqun Feng <boqun.f...@gmail.com>
CC: Andrew Hunter <a...@google.com>
CC: Maged Michael <maged.mich...@gmail.com>
CC: Avi Kivity <a...@scylladb.com>
CC: Benjamin Herrenschmidt <b...@kernel.crashing.org>
CC: Paul Mackerras <pau...@samba.org>
CC: Michael Ellerman <m...@ellerman.id.au>
CC: Dave Watson <davejwat...@fb.com>
CC: Alan Stern <st...@rowland.harvard.edu>
CC: Will Deacon <will.dea...@arm.com>
CC: Andy Lutomirski <l...@kernel.org>
CC: Alice Ferrazzi <alice.ferra...@gmail.com>
CC: Paul Elder <paul.el...@pitt.edu>
CC: linux-kselft...@vger.kernel.org
CC: linux-a...@vger.kernel.org
---
 .../testing/selftests/membarrier/membarrier_test.c | 51 +++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/membarrier/membarrier_test.c 
b/tools/testing/selftests/membarrier/membarrier_test.c
index e6ee73d01fa1..bb9c58072c5c 100644
--- a/tools/testing/selftests/membarrier/membarrier_test.c
+++ b/tools/testing/selftests/membarrier/membarrier_test.c
@@ -132,6 +132,40 @@ static int test_membarrier_private_expedited_success(void)
        return 0;
 }
 
+static int test_membarrier_register_shared_expedited_success(void)
+{
+       int cmd = MEMBARRIER_CMD_REGISTER_SHARED_EXPEDITED, flags = 0;
+       const char *test_name = "sys membarrier 
MEMBARRIER_CMD_REGISTER_SHARED_EXPEDITED";
+
+       if (sys_membarrier(cmd, flags) != 0) {
+               ksft_exit_fail_msg(
+                       "%s test: flags = %d, errno = %d\n",
+                       test_name, flags, errno);
+       }
+
+       ksft_test_result_pass(
+               "%s test: flags = %d\n",
+               test_name, flags);
+       return 0;
+}
+
+static int test_membarrier_shared_expedited_success(void)
+{
+       int cmd = MEMBARRIER_CMD_SHARED_EXPEDITED, flags = 0;
+       const char *test_name = "sys membarrier 
MEMBARRIER_CMD_SHARED_EXPEDITED";
+
+       if (sys_membarrier(cmd, flags) != 0) {
+               ksft_exit_fail_msg(
+                       "%s test: flags = %d, errno = %d\n",
+                       test_name, flags, errno);
+       }
+
+       ksft_test_result_pass(
+               "%s test: flags = %d\n",
+               test_name, flags);
+       return 0;
+}
+
 static int test_membarrier(void)
 {
        int status;
@@ -154,6 +188,19 @@ static int test_membarrier(void)
        status = test_membarrier_private_expedited_success();
        if (status)
                return status;
+       /*
+        * It is valid to send a shared membarrier from a non-registered
+        * process.
+        */
+       status = test_membarrier_shared_expedited_success();
+       if (status)
+               return status;
+       status = test_membarrier_register_shared_expedited_success();
+       if (status)
+               return status;
+       status = test_membarrier_shared_expedited_success();
+       if (status)
+               return status;
        return 0;
 }
 
@@ -173,8 +220,10 @@ static int test_membarrier_query(void)
                }
                ksft_exit_fail_msg("sys_membarrier() failed\n");
        }
-       if (!(ret & MEMBARRIER_CMD_SHARED))
+       if (!(ret & MEMBARRIER_CMD_SHARED)) {
+               ksft_test_result_fail("sys_membarrier() CMD_SHARED query 
failed\n");
                ksft_exit_fail_msg("sys_membarrier is not supported.\n");
+       }
 
        ksft_test_result_pass("sys_membarrier available\n");
        return 0;
-- 
2.11.0