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.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241107-arm64-fp-stress-irritator-v2-6-c4b9622e36ee@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/tools/testing/selftests/arm64/fp/fp-stress.c b/tools/testing/selftests/arm64/fp/fp-stress.c
index ad867ff9687af3ee8214d6de0f136fde3d51aa93..74e23208b94cabad165819ffa35733374649d8aa 100644 (file)
--- a/tools/testing/selftests/arm64/fp/fp-stress.c
+++ b/tools/testing/selftests/arm64/fp/fp-stress.c
@@ -223,7 +223,7 @@ 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)