This is a note to let you know that I've just added the patch titled kselftest/arm64: Fix enumeration of systems without 128 bit SME for SSVE+ZA to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kselftest-arm64-fix-enumeration-of-systems-without-1.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 9afe98e4f52f525502c87e3f5690589b1073c93a Author: Mark Brown <broonie@xxxxxxxxxx> Date: Tue Jan 31 22:56:35 2023 +0000 kselftest/arm64: Fix enumeration of systems without 128 bit SME for SSVE+ZA [ Upstream commit a7db82f18cd3d85ea8ef70fca5946b441187ed6d ] The current signal handling tests for SME do not account for the fact that unlike SVE all SME vector lengths are optional so we can't guarantee that we will encounter the minimum possible VL, they will hang enumerating VLs on such systems. Abort enumeration when we find the lowest VL in the newly added ssve_za_regs test. Fixes: bc69da5ff087 ("kselftest/arm64: Verify simultaneous SSVE and ZA context generation") Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Link: https://lore.kernel.org/r/20230131-arm64-kselftest-sig-sme-no-128-v1-2-d47c13dc8e1e@xxxxxxxxxx Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> Stable-dep-of: 5225b6562b9a ("kselftest/arm64: signal: fix/refactor SVE vector length enumeration") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c b/tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c index 954a21f6121a2..1f62621794d50 100644 --- a/tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c +++ b/tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c @@ -34,6 +34,10 @@ static bool sme_get_vls(struct tdescr *td) vl &= PR_SME_VL_LEN_MASK; + /* Did we find the lowest supported VL? */ + if (vq < sve_vq_from_vl(vl)) + break; + /* Skip missing VLs */ vq = sve_vq_from_vl(vl);