Hi, The following patches are from the PREEMPT_RT queue. It is mostly about disabling interrupts/preemption which leads to problems. Unfortunately DRM_I915_LOW_LEVEL_TRACEPOINTS had to be disabled because it acquires locks from within trace points. Making the lock a raw_spinlock_t led to higher latencies during video playback https://lore.kernel.org/all/20211006164628.s2mtsdd2jdbfyf7g@xxxxxxxxxxxxx/ and I'm not sure if I hit the worse case here. I tested it on a SandyBridge with built-in i915 by using X, OpenGL and playing videos without noticing any warnings. However, some code paths were not entered. I carry them for some time now and most issues were reported by other people and they reported that things work for them since. v1…v2: - The tracing disable bits (4/8) have been reworked after Steven pointed out that something isn't right. - The irq_work() bits have been dropped because they are no longer needed.
