linux-kernel - [PATCH AUTOSEL 6.6 8/9] kselftest/arm64: Corrupt P0 in the irritator when testing SSVE

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Message-ID: <20241124124057.3336453-8-sashal@kernel.org>
Date: Sun, 24 Nov 2024 07:40:46 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Mark Brown <broonie@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Sasha Levin <sashal@...nel.org>,
	will@...nel.org,
	shuah@...nel.org,
	mark.rutland@....com,
	thiago.bauermann@...aro.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 8/9] kselftest/arm64: Corrupt P0 in the irritator when testing SSVE

From: Mark Brown <broonie@...nel.org>

[ Upstream commit 3e360ef0c0a1fb6ce9a302e40b8057c41ba8a9d2 ]

When building for streaming SVE the irritator for SVE skips updates of both
P0 and FFR. While FFR is skipped since it might not be present there is no
reason to skip corrupting P0 so switch to an instruction valid in streaming
mode and move the ifdef.

Signed-off-by: Mark Brown <broonie@...nel.org>
Link: https://lore.kernel.org/r/20241107-arm64-fp-stress-irritator-v2-3-c4b9622e36ee@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/arm64/fp/sve-test.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/arm64/fp/sve-test.S b/tools/testing/selftests/arm64/fp/sve-test.S
index 4328895dfc876..ff60360a97f80 100644
--- a/tools/testing/selftests/arm64/fp/sve-test.S
+++ b/tools/testing/selftests/arm64/fp/sve-test.S
@@ -304,9 +304,9 @@ function irritator_handler
 	movi	v0.8b, #1
 	movi	v9.16b, #2
 	movi	v31.8b, #3
-#ifndef SSVE
 	// And P0
-	rdffr	p0.b
+	ptrue	p0.d
+#ifndef SSVE
 	// And FFR
 	wrffr	p15.b
 #endif
-- 
2.43.0