drm/i915: Depend on !PREEMPT_RT.

There are a few sections in the driver which are not compatible with
PREEMPT_RT. They trigger warnings and can lead to deadlocks at runtime.

Disable the i915 driver on a PREEMPT_RT enabled kernel. This way
PREEMPT_RT itself can be enabled without needing to address the i915
issues first. The RT related patches are still in RT queue and will be
handled later.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/YgqmfKhwU5spS069@linutronix.de

diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 2ac220b..63db8bc 100644 (file)
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -3,6 +3,7 @@ config DRM_I915
        tristate "Intel 8xx/9xx/G3x/G4x/HD Graphics"
        depends on DRM
        depends on X86 && PCI
+       depends on !PREEMPT_RT
        select INTEL_GTT
        select INTERVAL_TREE
        # we need shmfs for the swappable backing store, and in particular