From c9d9331a397728e037678c71c4292061d2187de2 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Tue, 27 Dec 2022 13:06:35 +0000 Subject: [PATCH] kselftest/arm64: Fix syscall-abi for systems without 128 bit SME [ Upstream commit 8ee0ac3bd6896878fe9fd867f1f7779062a13a0a ] SME does not mandate any specific VL so we may not have 128 bit SME but the algorithm used for enumerating VLs assumes that we will. Add the required check to ensure that the algorithm terminates. Fixes: 2063759f548e ("kselftest/arm64: Add SME support to syscall ABI test") Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20221223-arm64-syscall-abi-sme-only-v1-1-4fabfbd62087@kernel.org Signed-off-by: Catalin Marinas Signed-off-by: Sasha Levin --- tools/testing/selftests/arm64/abi/syscall-abi.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/testing/selftests/arm64/abi/syscall-abi.c b/tools/testing/selftests/arm64/abi/syscall-abi.c index dd7ebe536d05f..ffe719b50c215 100644 --- a/tools/testing/selftests/arm64/abi/syscall-abi.c +++ b/tools/testing/selftests/arm64/abi/syscall-abi.c @@ -390,6 +390,10 @@ static void test_one_syscall(struct syscall_cfg *cfg) sme_vl &= PR_SME_VL_LEN_MASK; + /* Found lowest VL */ + if (sve_vq_from_vl(sme_vl) > sme_vq) + break; + if (sme_vq != sve_vq_from_vl(sme_vl)) sme_vq = sve_vq_from_vl(sme_vl); @@ -461,6 +465,10 @@ int sme_count_vls(void) vl &= PR_SME_VL_LEN_MASK; + /* Found lowest VL */ + if (sve_vq_from_vl(vl) > vq) + break; + if (vq != sve_vq_from_vl(vl)) vq = sve_vq_from_vl(vl); -- 2.39.5