selftests/bpf: Move sys_pidfd_open() into task_local_storage_helpers.h

sys_pidfd_open() is defined twice in both test_bprm_opts.c and
test_local_storage.c, so move it to a common header file. And it will be
used in map_tests as well.

Signed-off-by: Hou Tao <[e-mail]>
Acked-by: Alexei Starovoitov <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Martin KaFai Lau <[e-mail]>

tools/testing/selftests/bpf/prog_tests/test_bprm_opts.c

···
 
 #include "bprm_opts.skel.h"
 #include "network_helpers.h"
-
-#ifndef __NR_pidfd_open
-#define __NR_pidfd_open 434
-#endif
+#include "task_local_storage_helpers.h"
 
 static const char * const bash_envp[] = { "TMPDIR=shouldnotbeset", NULL };
-
-static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
-{
-	return syscall(__NR_pidfd_open, pid, flags);
-}
 
 static int update_storage(int map_fd, int secureexec)
 {

tools/testing/selftests/bpf/prog_tests/test_local_storage.c

···
 
 #include "local_storage.skel.h"
 #include "network_helpers.h"
-
-#ifndef __NR_pidfd_open
-#define __NR_pidfd_open 434
-#endif
-
-static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
-{
-	return syscall(__NR_pidfd_open, pid, flags);
-}
+#include "task_local_storage_helpers.h"
 
 static unsigned int duration;
 

tools/testing/selftests/bpf/task_local_storage_helpers.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __TASK_LOCAL_STORAGE_HELPER_H
+#define __TASK_LOCAL_STORAGE_HELPER_H
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+
+#ifndef __NR_pidfd_open
+#define __NR_pidfd_open 434
+#endif
+
+static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
+{
+	return syscall(__NR_pidfd_open, pid, flags);
+}
+
+#endif