diff mbox series

[2/2] kselftest/arm64: Fix enumeration of systems without 128 bit SME for SSVE+ZA

Message ID 20230131-arm64-kselftest-sig-sme-no-128-v1-2-d47c13dc8e1e@kernel.org (mailing list archive)
State Accepted
Commit a7db82f18cd3d85ea8ef70fca5946b441187ed6d
Headers show
Series kselftest/arm64: Fix enumeration of SME VLs on systems without VL 128 | expand

Commit Message

Mark Brown Jan. 31, 2023, 10:56 p.m. UTC 
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@kernel.org>
---
 tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

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 954a21f6121a..1f62621794d5 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);