linux-kernel - Re: [ANNOUNCE] 4.0.4-rt1

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Date:	Tue, 26 May 2015 08:34:49 -0500
From:	Clark Williams <williams@...hat.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, rostedt@...dmis.org,
	John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 4.0.4-rt1

On Tue, 19 May 2015 23:39:23 +0200
Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> Dear RT folks!
> 
> I'm pleased to announce the v4.0.4-rt1 patch set.
> 

Sebastian,


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

Ifdef it out for PREEMPT_RT_FULL.

Signed-off-by: Clark Williams <williams@...hat.com>
---
 drivers/gpu/drm/i915/intel_display.c | 2 ++
 1 file changed, 2 insertions(+)

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
 
 	if (crtc == NULL)
 		return;
--
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