The patch titled
Subject: selftests: add membarrier syscall test
has been added to the -mm tree. Its filename is
selftests-add-membarrier-syscall-test.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/selftests-add-membarrier-syscall-test.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/selftests-add-membarrier-syscall-test.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Pranith Kumar <bobby.prani@xxxxxxxxx>
Subject: selftests: add membarrier syscall test
Add a self test for the membarrier system call.
Signed-off-by: Pranith Kumar <bobby.prani@xxxxxxxxx>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/Makefile | 1
tools/testing/selftests/membarrier/.gitignore | 1
tools/testing/selftests/membarrier/Makefile | 11 +
tools/testing/selftests/membarrier/membarrier_test.c | 71 ++++++++++
4 files changed, 84 insertions(+)
diff -puN tools/testing/selftests/Makefile~selftests-add-membarrier-syscall-test tools/testing/selftests/Makefile
--- a/tools/testing/selftests/Makefile~selftests-add-membarrier-syscall-test
+++ a/tools/testing/selftests/Makefile
@@ -7,6 +7,7 @@ TARGETS += ftrace
TARGETS += futex
TARGETS += kcmp
TARGETS += kdbus
+TARGETS += membarrier
TARGETS += memfd
TARGETS += memory-hotplug
TARGETS += mount
diff -puN /dev/null tools/testing/selftests/membarrier/.gitignore
--- /dev/null
+++ a/tools/testing/selftests/membarrier/.gitignore
@@ -0,0 +1 @@
+membarrier_test
diff -puN /dev/null tools/testing/selftests/membarrier/Makefile
--- /dev/null
+++ a/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 -puN /dev/null tools/testing/selftests/membarrier/membarrier_test.c
--- /dev/null
+++ a/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();
+}
_
Patches currently in -mm which might be from bobby.prani@xxxxxxxxx are
linux-next.patch
sys_membarrier-system-wide-memory-barrier-generic-x86.patch
selftests-add-membarrier-syscall-test.patch
selftests-enhance-membarrier-syscall-test.patch
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