On Thu, Sep 04, 2025 at 01:39:31PM +0530, Hari Bathini wrote:
>
>
> On 29/08/25 10:21 pm, Saket Kumar Bhaskar wrote:
> > For systems having CONFIG_NR_CPUS set to > 1024 in kernel config
> > the selftest fails as arena_spin_lock_irqsave() returns EOPNOTSUPP.
> >
> > The selftest is skipped incase bpf program returns EOPNOTSUPP,
> > with a descriptive message logged.
> >
> > Signed-off-by: Saket Kumar Bhaskar <sk...@linux.ibm.com>
> > ---
> > .../selftests/bpf/prog_tests/arena_spin_lock.c | 13 +++++++++++++
> > tools/testing/selftests/bpf/progs/arena_spin_lock.c | 5 ++++-
> > 2 files changed, 17 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c
> > b/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c
> > index 0223fce4db2b..1ec1ca987893 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/arena_spin_lock.c
> > @@ -40,8 +40,13 @@ static void *spin_lock_thread(void *arg)
> > err = bpf_prog_test_run_opts(prog_fd, &topts);
> > ASSERT_OK(err, "test_run err");
> > +
> > + if (topts.retval == -EOPNOTSUPP)
> > + goto end;
> > +
> > ASSERT_EQ((int)topts.retval, 0, "test_run retval");
> > +end:
> > pthread_exit(arg);
> > }
> > @@ -63,6 +68,7 @@ static void test_arena_spin_lock_size(int size)
> > skel = arena_spin_lock__open_and_load();
> > if (!ASSERT_OK_PTR(skel, "arena_spin_lock__open_and_load"))
> > return;
> > +
> > if (skel->data->test_skip == 2) {
> > test__skip();
> > goto end;
> > @@ -86,6 +92,13 @@ static void test_arena_spin_lock_size(int size)
> > goto end_barrier;
> > }
> > + if (skel->data->test_skip == 2) {
> > + printf("%s:SKIP: %d CPUs exceed the maximum supported by arena
> > spinlock\n",
> > + __func__, get_nprocs());
> > + test__skip();
> > + goto end_barrier;
> > + }
> > +
> > ASSERT_EQ(skel->bss->counter, repeat * nthreads, "check counter value");
> > end_barrier:
> > diff --git a/tools/testing/selftests/bpf/progs/arena_spin_lock.c
> > b/tools/testing/selftests/bpf/progs/arena_spin_lock.c
> > index c4500c37f85e..a475b974438e 100644
> > --- a/tools/testing/selftests/bpf/progs/arena_spin_lock.c
> > +++ b/tools/testing/selftests/bpf/progs/arena_spin_lock.c
> > @@ -37,8 +37,11 @@ int prog(void *ctx)
> > #if defined(ENABLE_ATOMICS_TESTS) &&
> > defined(__BPF_FEATURE_ADDR_SPACE_CAST)
> > unsigned long flags;
> > - if ((ret = arena_spin_lock_irqsave(&lock, flags)))
> > + if ((ret = arena_spin_lock_irqsave(&lock, flags))) {
> > + if (ret == -EOPNOTSUPP)
> > + test_skip = 2;
> > return ret;
>
> test_skip being set to `1` when the test runs seems counter intuitive.
> How about setting test_skip to `0` when run conditions are met
> and test_skip=1 if run conditions are not met and
> test_skip=2 when operation is not supported?
>
> - Hari
That seems reasonable to me, but right now -EOPNOTSUPP is also
returned when run condition is not met i.e.:
if (CONFIG_NR_CPUS > 1024)
return -EOPNOTSUPP;
So do we really need test_skip = 2 ?
Thanks,
Saket
