Commit 97ec597b authored Dec 27, 2022 by Mark Brown Committed by Catalin Marinas Jan 12, 2023

kselftest/arm64: Fix syscall-abi for systems without 128 bit SME

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: 43e3f855 ("kselftest/arm64: Add SME support to syscall ABI test")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221223-arm64-syscall-abi-sme-only-v1-1-4fabfbd62087@kernel.org

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

parent b7bfaa76

tools/testing/selftests/arm64/abi/syscall-abi.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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);