diff options
Diffstat (limited to 'debian/patches-rt/0252-drm-i915-disable-tracing-on-RT.patch')
| -rw-r--r-- | debian/patches-rt/0252-drm-i915-disable-tracing-on-RT.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/debian/patches-rt/0252-drm-i915-disable-tracing-on-RT.patch b/debian/patches-rt/0252-drm-i915-disable-tracing-on-RT.patch new file mode 100644 index 000000000..833c9d37f --- /dev/null +++ b/debian/patches-rt/0252-drm-i915-disable-tracing-on-RT.patch @@ -0,0 +1,47 @@ +From 0e88cde8cbd40cc7e519bccaf1ba847de2d9bd02 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Thu, 6 Dec 2018 09:52:20 +0100 +Subject: [PATCH 252/323] drm/i915: disable tracing on -RT +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +Luca Abeni reported this: +| BUG: scheduling while atomic: kworker/u8:2/15203/0x00000003 +| CPU: 1 PID: 15203 Comm: kworker/u8:2 Not tainted 4.19.1-rt3 #10 +| Call Trace: +| rt_spin_lock+0x3f/0x50 +| gen6_read32+0x45/0x1d0 [i915] +| g4x_get_vblank_counter+0x36/0x40 [i915] +| trace_event_raw_event_i915_pipe_update_start+0x7d/0xf0 [i915] + +The tracing events use trace_i915_pipe_update_start() among other events +use functions acquire spin locks. A few trace points use +intel_get_crtc_scanline(), others use ->get_vblank_counter() wich also +might acquire a sleeping lock. + +Based on this I don't see any other way than disable trace points on RT. + +Cc: stable-rt@vger.kernel.org +Reported-by: Luca Abeni <lucabe72@gmail.com> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + drivers/gpu/drm/i915/i915_trace.h | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h +index a4addcc64978..0ba5a0a0fd25 100644 +--- a/drivers/gpu/drm/i915/i915_trace.h ++++ b/drivers/gpu/drm/i915/i915_trace.h +@@ -2,6 +2,10 @@ + #if !defined(_I915_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ) + #define _I915_TRACE_H_ + ++#ifdef CONFIG_PREEMPT_RT ++#define NOTRACE ++#endif ++ + #include <linux/stringify.h> + #include <linux/types.h> + #include <linux/tracepoint.h> +-- +2.43.0 + |