Re: [PATCH] selftests: futex: Restore support checks for futex2 and priv_hash

[Carlos Llamas <cmllamas@google.com>]

On Wed, Jul 22, 2026 at 12:20:37PM -0300, André Almeida wrote:
> Hi Wake,
> 
> Em 22/07/2026 04:08, Wake Liu escreveu:
> > Older kernels may not support FUTEX2 syscalls or PR_FUTEX_HASH.
> > Removing these checks causes false failures when running the tests on
> > such kernels. Restore the checks so the tests can be gracefully
> > skipped when the features are not supported.
> > 
> > Signed-off-by: Wake Liu <wakel@google.com>
> > ---
> >   tools/testing/selftests/futex/functional/futex_numa_mpol.c | 2 ++
> >   tools/testing/selftests/futex/functional/futex_priv_hash.c | 2 ++
> >   2 files changed, 4 insertions(+)
> > 
> > diff --git a/tools/testing/selftests/futex/functional/futex_numa_mpol.c b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
> > index 78c0f7a59e17..d215acf88120 100644
> > --- a/tools/testing/selftests/futex/functional/futex_numa_mpol.c
> > +++ b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
> > @@ -103,6 +103,8 @@ static void __test_futex(void *futex_ptr, int err_value, unsigned int futex_flag
> >   			break;
> >   		}
> >   		if (ret < 0) {
> > +			if (errno == ENOSYS || (errno == EINVAL && (futex_flags & FUTEX2_NUMA)))
> > +				ksft_exit_skip("futex2 or FUTEX2_NUMA not supported by kernel\n");
> 
> Why aren't you using SKIP() instead of ksft_exit_skip() like how you have
> done at
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=locking/futex&id=50c121e5a57abe446e46825fb9c69ac419765d5c

It's actually the same patch. See:
https://lore.kernel.org/all/20260624070223.1533167-1-wakel@google.com/
Thomas, just refactored it to use the harness API.

I'm not sure why Wake sent the same fix twice but it was likely by
mistake. That's all, nothing to see here.

--
Carlos Llamas