[PATCH] drm/radeon: make MMU_NOTIFIER optional

[Rob Clark]

In cases where MMU_NOTIFIER is not available, userptr will not be
available.  Similar to i915, although not making an exception for
CAP_SYS_ADMIN.

The proposed userspace patches for userptr seem to handle the fall-
back properly, so a userptr-less kernel should not be a problem.

Signed-off-by: Rob Clark <robdclark at gmail.com>
---
 drivers/gpu/drm/Kconfig         | 1 -
 drivers/gpu/drm/radeon/Makefile | 5 +++--
 drivers/gpu/drm/radeon/radeon.h | 8 ++++++++
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index c3413b6..75e6a88 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -110,7 +110,6 @@ config DRM_RADEON
 	select HWMON
 	select BACKLIGHT_CLASS_DEVICE
 	select INTERVAL_TREE
-	select MMU_NOTIFIER
 	help
 	  Choose this option if you have an ATI Radeon graphics card.  There
 	  are both PCI and AGP versions.  You don't need to choose this to
diff --git a/drivers/gpu/drm/radeon/Makefile b/drivers/gpu/drm/radeon/Makefile
index 12bc212..5e7a38b 100644
--- a/drivers/gpu/drm/radeon/Makefile
+++ b/drivers/gpu/drm/radeon/Makefile
@@ -80,8 +80,9 @@ radeon-y += radeon_device.o radeon_asic.o radeon_kms.o \
 	r600_dpm.o rs780_dpm.o rv6xx_dpm.o rv770_dpm.o rv730_dpm.o rv740_dpm.o \
 	rv770_smc.o cypress_dpm.o btc_dpm.o sumo_dpm.o sumo_smc.o trinity_dpm.o \
 	trinity_smc.o ni_dpm.o si_smc.o si_dpm.o kv_smc.o kv_dpm.o ci_smc.o \
-	ci_dpm.o dce6_afmt.o radeon_vm.o radeon_ucode.o radeon_ib.o radeon_mn.o \
-	radeon_sync.o
+	ci_dpm.o dce6_afmt.o radeon_vm.o radeon_ucode.o radeon_ib.o radeon_sync.o
+
+radeon-$(CONFIG_MMU_NOTIFIER) += radeon_mn.o
 
 # add async DMA block
 radeon-y += \
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 54529b8..52611d2 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1777,8 +1777,16 @@ void radeon_test_syncing(struct radeon_device *rdev);
 /*
  * MMU Notifier
  */
+#if defined(CONFIG_MMU_NOTIFIER)
 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr);
 void radeon_mn_unregister(struct radeon_bo *bo);
+#else
+static inline int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
+{
+	return -ENODEV;
+}
+static inline void radeon_mn_unregister(struct radeon_bo *bo) {}
+#endif
 
 /*
  * Debugfs
-- 
2.1.0