On Tue, 26 May 2015 09:38:32 -0400
Steven Rostedt [off-list ref] wrote:

On Tue, 26 May 2015 08:34:49 -0500
Clark Williams [off-list ref] wrote:
 

quoted

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f75173c20f47..f532b22f56ba 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c

@@ -9745,7 +9745,9 @@ void intel_check_page_flip(struct drm_device *dev, int pipe)
 	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 	WARN_ON(!in_interrupt());
+#endif

Or just use our special WARN_ON() functions...


	WARN_ON_NONRT(!in_interrupt());

-- Steve

good point. Updated patch:

From: Clark Williams <redacted>
Date: Thu, 21 May 2015 12:51:53 -0500
Subject: [PATCH] [rt] 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

Signed-off-by: Clark Williams <redacted>
---
 drivers/gpu/drm/i915/intel_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f75173c20f47..b21e3a334e4e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c

@@ -9745,7 +9745,7 @@ void intel_check_page_flip(struct drm_device *dev, int pipe)
 	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
-	WARN_ON(!in_interrupt());
+	WARN_ON_NORT(!in_interrupt());
 
 	if (crtc == NULL)
 		return;

-- 
2.1.0