linux-kernel - [PATCH 6/6] kselftest/arm64: Test signal handler state modification in fp-stress

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Message-Id: <20241023-arm64-fp-stress-irritator-v1-6-a51af298d449@kernel.org>
Date: Wed, 23 Oct 2024 21:38:34 +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 6/6] kselftest/arm64: Test signal handler state
 modification in fp-stress

Currently in fp-stress we test signal delivery to the test threads by
sending SIGUSR2 which simply counts how many signals are delivered. The
test programs now also all have a SIGUSR1 handler which for the threads
doing userspace testing additionally modifies the floating point register
state in the signal handler, verifying that when we return the saved
register state is restored from the signal context as expected. Switch over
to triggering that to validate that we are restoring as expected.

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

diff --git a/tools/testing/selftests/arm64/fp/fp-stress.c b/tools/testing/selftests/arm64/fp/fp-stress.c
index faac24bdefeb9436e2daf20b7250d0ae25ca23a7..3d477249dee0632b662b48582433d39323d18e18 100644
--- a/tools/testing/selftests/arm64/fp/fp-stress.c
+++ b/tools/testing/selftests/arm64/fp/fp-stress.c
@@ -221,7 +221,7 @@ static void child_output(struct child_data *child, uint32_t events,
 static void child_tickle(struct child_data *child)
 {
 	if (child->output_seen && !child->exited)
-		kill(child->pid, SIGUSR2);
+		kill(child->pid, SIGUSR1);
 }
 
 static void child_stop(struct child_data *child)

-- 
2.39.2