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kernel add
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#define _GNU_SOURCE
#include <linux/membarrier.h>
#include <syscall.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "../kselftest.h"
enum test_membarrier_status {
TEST_MEMBARRIER_PASS = 0,
TEST_MEMBARRIER_FAIL,
TEST_MEMBARRIER_SKIP,
};
static int sys_membarrier(int cmd, int flags)
{
return syscall(__NR_membarrier, cmd, flags);
}
static enum test_membarrier_status test_membarrier_cmd_fail(void)
{
int cmd = -1, flags = 0;
if (sys_membarrier(cmd, flags) != -1) {
printf("membarrier: Wrong command should fail but passed.
");
return TEST_MEMBARRIER_FAIL;
}
return TEST_MEMBARRIER_PASS;
}
static enum test_membarrier_status test_membarrier_flags_fail(void)
{
int cmd = MEMBARRIER_CMD_QUERY, flags = 1;
if (sys_membarrier(cmd, flags) != -1) {
printf("membarrier: Wrong flags should fail but passed.
");
return TEST_MEMBARRIER_FAIL;
}
return TEST_MEMBARRIER_PASS;
}
static enum test_membarrier_status test_membarrier_success(void)
{
int cmd = MEMBARRIER_CMD_SHARED, flags = 0;
if (sys_membarrier(cmd, flags) != 0) {
printf("membarrier: Executing MEMBARRIER_CMD_SHARED failed. %s.
",
strerror(errno));
return TEST_MEMBARRIER_FAIL;
}
printf("membarrier: MEMBARRIER_CMD_SHARED success.
");
return TEST_MEMBARRIER_PASS;
}
static enum test_membarrier_status test_membarrier(void)
{
enum test_membarrier_status status;
status = test_membarrier_cmd_fail();
if (status)
return status;
status = test_membarrier_flags_fail();
if (status)
return status;
status = test_membarrier_success();
if (status)
return status;
return TEST_MEMBARRIER_PASS;
}
static enum test_membarrier_status test_membarrier_query(void)
{
int flags = 0, ret;
printf("membarrier MEMBARRIER_CMD_QUERY ");
ret = sys_membarrier(MEMBARRIER_CMD_QUERY, flags);
if (ret < 0) {
printf("failed. %s.
", strerror(errno));
switch (errno) {
case ENOSYS:
/*
* It is valid to build a kernel with
* CONFIG_MEMBARRIER=n. However, this skips the tests.
*/
return TEST_MEMBARRIER_SKIP;
case EINVAL:
default:
return TEST_MEMBARRIER_FAIL;
}
}
if (!(ret & MEMBARRIER_CMD_SHARED)) {
printf("command MEMBARRIER_CMD_SHARED is not supported.
");
return TEST_MEMBARRIER_FAIL;
}
printf("syscall available.
");
return TEST_MEMBARRIER_PASS;
}
int main(int argc, char **argv)
{
switch (test_membarrier_query()) {
case TEST_MEMBARRIER_FAIL:
return ksft_exit_fail();
case TEST_MEMBARRIER_SKIP:
return ksft_exit_skip();
}
switch (test_membarrier()) {
case TEST_MEMBARRIER_FAIL:
return ksft_exit_fail();
case TEST_MEMBARRIER_SKIP:
return ksft_exit_skip();
}
printf("membarrier: tests done!
");
return ksft_exit_pass();
}
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