selftests/exec: report the skipped binfmt_misc_bpf test on stderr

The exec Makefile announces that binfmt_misc_bpf is skipped with
$(info), which writes to standard output whenever the Makefile is
parsed. The selftests install target appends the standard output of
"make -s emit_tests" to kselftest-list.txt, so on systems without the
BPF toolchain the runlist gains a line that is not a test entry:

  exec selftests: skipping binfmt_misc_bpf, needs clang, bpftool, ...

run_kselftest.sh and CI systems that parse the runlist then treat it as
a malformed test entry.

Use $(warning) so that the notice still appears in build logs but goes
to standard error.

Fixes: 277d787feb2e ("selftests/exec: add binfmt_misc bpf-backed handler test")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Link: https://patch.msgid.link/20261014200135.1364053-1-sashal@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>

0 files changed, 0 insertions, 0 deletions