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
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 263213285dde5cde900dd4fc73aa795e031a5530
Author: Mark Brown <broonie@xxxxxxxxxx>
Date: Tue Jan 31 22:56:34 2023 +0000
kselftest/arm64: Fix enumeration of systems without 128 bit SME
[ Upstream commit 5f389238534ac8ca4ee3ab12eeb89d3984d303a1 ]
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.
Fixes: 4963aeb35a9e ("kselftest/arm64: signal: Add SME signal handling tests")
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230131-arm64-kselftest-sig-sme-no-128-v1-1-d47c13dc8e1e@xxxxxxxxxx
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/arm64/signal/testcases/ssve_regs.c b/tools/testing/selftests/arm64/signal/testcases/ssve_regs.c
index d0a178945b1a8..c6b17c47cac4c 100644
--- a/tools/testing/selftests/arm64/signal/testcases/ssve_regs.c
+++ b/tools/testing/selftests/arm64/signal/testcases/ssve_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);
diff --git a/tools/testing/selftests/arm64/signal/testcases/za_regs.c b/tools/testing/selftests/arm64/signal/testcases/za_regs.c
index ea45acb115d5b..174ad66566964 100644
--- a/tools/testing/selftests/arm64/signal/testcases/za_regs.c
+++ b/tools/testing/selftests/arm64/signal/testcases/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);
