[PATCH v1 2/5] selftests/arm64: Allow zero tags in mte_switch_mode()

[Mark Brown]

mte_switch_mode() currently rejects attempts to set a zero tag however
there are tests such as check_tags_inclusion which attempt to cover cases
with zero tags using mte_switch_mode(). Since it is not clear why we are
rejecting zero tags change the test to accept them.

The issue has not previously been as apparent as it should be since the
return value of mte_switch_mode() was not always checked in the callers
and the tests weren't otherwise failing.

Signed-off-by: Mark Brown <broonie at kernel.org>
---
 tools/testing/selftests/arm64/mte/mte_common_util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/arm64/mte/mte_common_util.c b/tools/testing/selftests/arm64/mte/mte_common_util.c
index 260206f4dce0..6ff4c4bcbff1 100644
--- a/tools/testing/selftests/arm64/mte/mte_common_util.c
+++ b/tools/testing/selftests/arm64/mte/mte_common_util.c
@@ -283,7 +283,7 @@ int mte_switch_mode(int mte_option, unsigned long incl_mask)
 		return -EINVAL;
 	}
 
-	if (!(incl_mask <= MTE_ALLOW_NON_ZERO_TAG)) {
+	if (incl_mask & ~MT_INCLUDE_TAG_MASK) {
 		ksft_print_msg("FAIL: Invalid incl_mask %lx\n", incl_mask);
 		return -EINVAL;
 	}
-- 
2.30.2