10:39 <liquidAcid> does someone know of a guide or something about dos and don'ts in spinlock sections?

10:40 <liquidAcid> in particular i'd like to know if it's a good idea to do a large amount of printk under a spinlock

14:56 <liquidAcid> prahal, hey, i've ironed out some more bugs in odroid-4.0.y, restores hdmi for me at least

14:58 <prahal> got iommu "stable" (I had a crash on Xorg restart only htough) on my side (via an old rework of the dma mapping in exynos_drm_iommu )

14:58 <prahal> will take a look at your branch in a few hours. Thanks !

14:59 <liquidAcid> prahal, the sysmmu pagefault was probably related by printks while under spinlock/irqs disabled

15:01 <prahal> yes , mine was located other place than yours but also ended in a spin lock

15:01 <prahal> probably I ended later as yours was triggered by debug in drm that I have off as of now

15:01 <prahal> will try with my diff and debug on

15:02 <liquidAcid> https://github.com/tobiasjakobi/linux-odroid/commit/d619dc5da8ee5be2be1ae1a40205de508b3549c9

15:02 <liquidAcid> with that drm.debug=0xff works again