On Thu, Oct 6, 2022 at 10:21 AM Martin KaFai Lau <martin.lau@xxxxxxxxx> wrote:
>
> On 10/6/22 1:31 AM, Jiri Olsa wrote:
> > Adding missing bpf_iter_vma_offset__destroy call and using in-skeletin
> > link pointer so we don't need extra bpf_link__destroy call.
> >
> > Fixes: b3e1331eb925 ("selftests/bpf: Test parameterized task BPF iterators.")
> > Cc: Kui-Feng Lee <kuifeng@xxxxxx>
> > Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> > ---
> > v2 changes:
> > - use in-skeletin link pointer and destroy call [Martin]
> >
> > tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 13 +++++++------
> > 1 file changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> > index 3369c5ec3a17..d4437a2bba28 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> > @@ -1498,7 +1498,6 @@ static noinline int trigger_func(int arg)
> > static void test_task_vma_offset_common(struct bpf_iter_attach_opts *opts, bool one_proc)
> > {
> > struct bpf_iter_vma_offset *skel;
> > - struct bpf_link *link;
> > char buf[16] = {};
> > int iter_fd, len;
> > int pgsz, shift;
> > @@ -1513,11 +1512,13 @@ static void test_task_vma_offset_common(struct bpf_iter_attach_opts *opts, bool
> > ;
> > skel->bss->page_shift = shift;
> >
> > - link = bpf_program__attach_iter(skel->progs.get_vma_offset, opts);
> > - if (!ASSERT_OK_PTR(link, "attach_iter"))
> > - return;
> > + skel->links.get_vma_offset = bpf_program__attach_iter(skel->progs.get_vma_offset, opts);
> > + if (!ASSERT_OK_PTR(skel->links.get_vma_offset, "attach_iter")) {
> > + skel->links.get_vma_offset = NULL;
>
> Applied with this NULL assignment removed. bpf_link__destroy() can handle err
> ptr. Thanks.
>
It's even better, with libbpf 1.0 there is no err ptr, it's NULL on
error. So good call for removing this!
>
> > + goto exit;
> > + }
> >
> > - iter_fd = bpf_iter_create(bpf_link__fd(link));
> > + iter_fd = bpf_iter_create(bpf_link__fd(skel->links.get_vma_offset));
> > if (!ASSERT_GT(iter_fd, 0, "create_iter"))
> > goto exit;
> >
> > @@ -1535,7 +1536,7 @@ static void test_task_vma_offset_common(struct bpf_iter_attach_opts *opts, bool
> > close(iter_fd);
> >
> > exit:
> > - bpf_link__destroy(link);
> > + bpf_iter_vma_offset__destroy(skel);
> > }
> >
> > static void test_task_vma_offset(void)
>
