[PATCH v5 6/6] drm/i915: Use sleeping selftests for igt_atomic on PREEMPT_RT

[Maarten Lankhorst <dev@lankhorst.se>]

This makes the i915 selftests slightly happier, especially
related to GPU reset.

All of the i915 code that used to run in BH's, IRQ's, etc is
converted to preemptible code when compiled with PREEMPT_RT,
so adding coverage for those situations would require

This is a better approach than trying to convert all locks
in i915 from spinlock_t to to raw_spinlock_t just to increase
test coverage for situations that no longer happen.

Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
---
 drivers/gpu/drm/i915/selftests/igt_atomic.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/igt_atomic.c b/drivers/gpu/drm/i915/selftests/igt_atomic.c
index fb506b6990956..8ae39cf570b76 100644
--- a/drivers/gpu/drm/i915/selftests/igt_atomic.c
+++ b/drivers/gpu/drm/i915/selftests/igt_atomic.c
@@ -39,7 +39,14 @@ static void __hardirq_end(void)
 	local_irq_enable();
 }
 
+static void __maybe_unused __nop(void)
+{}
+
 const struct igt_atomic_section igt_atomic_phases[] = {
+#if IS_ENABLED(CONFIG_PREEMPT_RT)
+	{ "sleeping", __nop, __nop },
+	{ },
+#endif
 	{ "preempt", __preempt_begin, __preempt_end },
 	{ "softirq", __softirq_begin, __softirq_end },
 	{ "hardirq", __hardirq_begin, __hardirq_end },
-- 
2.55.0