[PATCH bpf-next v2] bpf: handle implicit declaration of function gettid in bpf_iter.c

[Jason Xing]

From: Jason Xing <kernelx...@tencent.com>

As we can see from the title, when I compiled the selftests/bpf, I
saw the error:
implicit declaration of function ‘gettid’ ; did you mean ‘getgid’? 
[-Werror=implicit-function-declaration]
  skel->bss->tid = gettid();
                   ^~~~~~
                   getgid

Directly call the syscall solves this issue.

Signed-off-by: Jason Xing <kernelx...@tencent.com>
---
v2
Link: 
https://lore.kernel.org/all/20241028034143.14675-1-kerneljasonx...@gmail.com/
1. directly call the syscall (Andrii)
---
 tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c 
b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
index f0a3a9c18e9e..9006549a1294 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
@@ -226,7 +226,7 @@ static void test_task_common_nocheck(struct 
bpf_iter_attach_opts *opts,
        ASSERT_OK(pthread_create(&thread_id, NULL, &do_nothing_wait, NULL),
                  "pthread_create");
 
-       skel->bss->tid = gettid();
+       skel->bss->tid = syscall(SYS_gettid);
 
        do_dummy_read_opts(skel->progs.dump_task, opts);
 
@@ -255,10 +255,10 @@ static void *run_test_task_tid(void *arg)
        union bpf_iter_link_info linfo;
        int num_unknown_tid, num_known_tid;
 
-       ASSERT_NEQ(getpid(), gettid(), "check_new_thread_id");
+       ASSERT_NEQ(getpid(), syscall(SYS_gettid), "check_new_thread_id");
 
        memset(&linfo, 0, sizeof(linfo));
-       linfo.task.tid = gettid();
+       linfo.task.tid = syscall(SYS_gettid);
        opts.link_info = &linfo;
        opts.link_info_len = sizeof(linfo);
        test_task_common(&opts, 0, 1);
-- 
2.37.3