linux-kernel - [PATCH 5/6] kselftest/arm64: Provide a SIGUSR1 handler in the kernel mode FP stress test

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Message-Id: <20241023-arm64-fp-stress-irritator-v1-5-a51af298d449@kernel.org>
Date: Wed, 23 Oct 2024 21:38:33 +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 5/6] kselftest/arm64: Provide a SIGUSR1 handler in the
 kernel mode FP stress test

The other stress test programs provide a SIGUSR1 handler which modifies the
live register state in order to validate that signal context is being
restored during signal return. While we can't usefully do this when testing
kernel mode FP usage provide a handler for SIGUSR1 which just counts the
number of signals like we do for SIGUSR2, allowing fp-stress to treat all
the test programs uniformly.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/arm64/fp/kernel-test.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/arm64/fp/kernel-test.c b/tools/testing/selftests/arm64/fp/kernel-test.c
index e8da3b4cbd23202c6504ffd8043f8ef351d739f6..859345379044fc287458644309d66cf5f3d8bdf5 100644
--- a/tools/testing/selftests/arm64/fp/kernel-test.c
+++ b/tools/testing/selftests/arm64/fp/kernel-test.c
@@ -267,6 +267,10 @@ int main(void)
 		       strerror(errno), errno);
 
 	sa.sa_sigaction = handle_kick_signal;
+	ret = sigaction(SIGUSR1, &sa, NULL);
+	if (ret < 0)
+		printf("Failed to install SIGUSR1 handler: %s (%d)\n",
+		       strerror(errno), errno);
 	ret = sigaction(SIGUSR2, &sa, NULL);
 	if (ret < 0)
 		printf("Failed to install SIGUSR2 handler: %s (%d)\n",

-- 
2.39.2