[PATCH] gpu/drm/amd/amdkfd: fix build, select MMU_NOTIFIER

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From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

When CONFIG_MMU_NOTIFIER is not enabled, struct mmu_notifier has an
incomplete type definition, which causes build errors.

../drivers/gpu/drm/amd/amdkfd/kfd_priv.h:607:22: error: field 'mmu_notifier' has incomplete type
../include/linux/kernel.h:979:32: error: dereferencing pointer to incomplete type
../include/linux/kernel.h:980:18: error: dereferencing pointer to incomplete type
../drivers/gpu/drm/amd/amdkfd/kfd_process.c:434:2: error: implicit declaration of function 'mmu_notifier_unregister_no_release' [-Werror=implicit-function-declaration]
../drivers/gpu/drm/amd/amdkfd/kfd_process.c:435:2: error: implicit declaration of function 'mmu_notifier_call_srcu' [-Werror=implicit-function-declaration]
../drivers/gpu/drm/amd/amdkfd/kfd_process.c:438:21: error: variable 'kfd_process_mmu_notifier_ops' has initializer but incomplete type
../drivers/gpu/drm/amd/amdkfd/kfd_process.c:439:2: error: unknown field 'release' specified in initializer
../drivers/gpu/drm/amd/amdkfd/kfd_process.c:439:2: warning: excess elements in struct initializer [enabled by default]
../drivers/gpu/drm/amd/amdkfd/kfd_process.c:439:2: warning: (near initialization for 'kfd_process_mmu_notifier_ops') [enabled by default]
../drivers/gpu/drm/amd/amdkfd/kfd_process.c:534:2: error: implicit declaration of function 'mmu_notifier_register' [-Werror=implicit-function-declaration]

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Oded Gabbay <oded.gabbay@xxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
---
>From linux-next, not mmotm, but found in mmotm builds.

 drivers/gpu/drm/amd/amdkfd/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- mmotm-2018-0413-1728.orig/drivers/gpu/drm/amd/amdkfd/Kconfig
+++ mmotm-2018-0413-1728/drivers/gpu/drm/amd/amdkfd/Kconfig
@@ -6,5 +6,6 @@ config HSA_AMD
 	tristate "HSA kernel driver for AMD GPU devices"
 	depends on DRM_AMDGPU && X86_64
 	imply AMD_IOMMU_V2
+	select MMU_NOTIFIER
 	help
 	  Enable this if you want to use HSA features on AMD GPU devices.

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