i915: bogus warning from i915 when running on PREEMPT_RT

The i915 driver has a 'WARN_ON(!in_interrupt())' in the display
handler, which whines constanly on the RT kernel (since the interrupt
is actually handled in a threaded handler and not actual interrupt
context).

Change the WARN_ON to WARN_ON_NORT

Tested-by: Joakim Hernberg <[email protected]>
Signed-off-by: Clark Williams <[email protected]>
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>

Author: clrkwllms

drivers/gpu/drm/i915/intel_display.c

@@ -12139,7 +12139,7 @@ void intel_check_page_flip(struct drm_i915_private *dev_priv, int pipe)
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_flip_work *work;
 
-	WARN_ON(!in_interrupt());
+	WARN_ON_NONRT(!in_interrupt());
 
 	if (crtc == NULL)
 		return;