kselftest/arm64: Skip VL_INHERIT tests for unsupported vector types

Currently we unconditionally test the ability to set the vector length
inheritance flag via ptrace meaning that we generate false failures on
systems that don't support SVE when we attempt to set the vector length
there. Check the hwcap and mark the tests as skipped when it's not present.

Fixes: 0ba1ce1e8605 ("selftests: arm64: Add coverage of ptrace flags for SVE VL inheritance")
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20220124175527.3260234-2-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/tools/testing/selftests/arm64/fp/sve-ptrace.c b/tools/testing/selftests/arm64/fp/sve-ptrace.c
index af798b9d232cc48723b88c5e2bade1fef837b13b..0cf78360c5bc21bfe18779305ecca35ab08eecaf 100644 (file)
--- a/tools/testing/selftests/arm64/fp/sve-ptrace.c
+++ b/tools/testing/selftests/arm64/fp/sve-ptrace.c
@@ -557,7 +557,14 @@ static int do_parent(pid_t child)
                }
 
                /* prctl() flags */
-               ptrace_set_get_inherit(child, &vec_types[i]);
+               if (getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap) {
+                       ptrace_set_get_inherit(child, &vec_types[i]);
+               } else {
+                       ksft_test_result_skip("%s SVE_PT_VL_INHERIT set\n",
+                                             vec_types[i].name);
+                       ksft_test_result_skip("%s SVE_PT_VL_INHERIT cleared\n",
+                                             vec_types[i].name);
+               }
 
                /* Step through every possible VQ */
                for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; vq++) {