linux-kernel - [PATCH 3/6] kselftest/arm64: Corrupt P15 in the irritator when testing SSVE

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Message-Id: <20241023-arm64-fp-stress-irritator-v1-3-a51af298d449@kernel.org>
Date: Wed, 23 Oct 2024 21:38:31 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>, 
 linux-arm-kernel@...ts.infradead.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH 3/6] kselftest/arm64: Corrupt P15 in the irritator when
 testing SSVE

When building for streaming SVE the irritator for SVE skips updates of both
P15 and FFR. While FFR is skipped since it might not be present there is no
reason to skip corrupting P15 so move the ifdef appropriately.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/arm64/fp/sve-test.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/arm64/fp/sve-test.S b/tools/testing/selftests/arm64/fp/sve-test.S
index f1fb9745c681786f686f1fafcb7e1154f3c8e1a3..3c88dfe9c8cad29f44217314aeaffa984bac05e5 100644
--- a/tools/testing/selftests/arm64/fp/sve-test.S
+++ b/tools/testing/selftests/arm64/fp/sve-test.S
@@ -302,9 +302,9 @@ function irritator_handler
 	movi	v0.8b, #1
 	movi	v9.16b, #2
 	movi	v31.8b, #3
-#ifndef SSVE
 	// And P0
 	rdffr	p0.b
+#ifndef SSVE
 	// And FFR
 	wrffr	p15.b
 #endif

-- 
2.39.2