From: Jason Xing <kernelxing@xxxxxxxxxxx>
commit 42602e3a06f8e5b9a059344e305c9bee2dcc87c8 upstream.
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 <kernelxing@xxxxxxxxxxx>
Reviewed-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
Tested-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241029074627.80289-1-kerneljasonxing@xxxxxxxxx
Signed-off-by: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
Cc: Alan Maguire <alan.maguire@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- 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(str
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);
Patches currently in stable-queue which might be from kernelxing@xxxxxxxxxxx are
queue-6.12/bpf-handle-implicit-declaration-of-function-gettid-in-bpf_iter.c.patch
