6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mark Brown <broonie@xxxxxxxxxx>
[ 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>
---
tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c | 4 ++++
1 file changed, 4 insertions(+)
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);
--
2.43.0
