Re: [PATCH hmm v2 1/5] mm/hmm: make CONFIG_DEVICE_PRIVATE into a select

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On 2020-05-01 11:20, Jason Gunthorpe wrote:
From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>

There is no reason for a user to select this or not directly - it should
be selected by drivers that are going to use the feature, similar to how
CONFIG_HMM_MIRROR works.

Yes, this is a nice touch.

Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>

thanks,
--
John Hubbard
NVIDIA


Currently all drivers provide a feature kconfig that will disable use of
DEVICE_PRIVATE in that driver, allowing users to avoid enabling this if
they don't want the overhead.

Acked-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
---
  arch/powerpc/Kconfig            | 2 +-
  drivers/gpu/drm/nouveau/Kconfig | 2 +-
  mm/Kconfig                      | 7 +------
  3 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 924c541a926008..8de52aefdc74cc 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -455,7 +455,7 @@ config PPC_TRANSACTIONAL_MEM
  config PPC_UV
  	bool "Ultravisor support"
  	depends on KVM_BOOK3S_HV_POSSIBLE
-	depends on DEVICE_PRIVATE
+	select DEVICE_PRIVATE
  	default n
  	help
  	  This option paravirtualizes the kernel to run in POWER platforms that
diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
index d6e4ae1ef7053a..af5793f3e7c2cf 100644
--- a/drivers/gpu/drm/nouveau/Kconfig
+++ b/drivers/gpu/drm/nouveau/Kconfig
@@ -86,10 +86,10 @@ config DRM_NOUVEAU_BACKLIGHT
config DRM_NOUVEAU_SVM
  	bool "(EXPERIMENTAL) Enable SVM (Shared Virtual Memory) support"
-	depends on DEVICE_PRIVATE
  	depends on DRM_NOUVEAU
  	depends on MMU
  	depends on STAGING
+	select DEVICE_PRIVATE
  	select HMM_MIRROR
  	select MMU_NOTIFIER
  	default n
diff --git a/mm/Kconfig b/mm/Kconfig
index c1acc34c1c358c..7ca36bf5f5058e 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -805,15 +805,10 @@ config HMM_MIRROR
  	depends on MMU
config DEVICE_PRIVATE
-	bool "Unaddressable device memory (GPU memory, ...)"
+	bool
  	depends on ZONE_DEVICE
  	select DEV_PAGEMAP_OPS
- help
-	  Allows creation of struct pages to represent unaddressable device
-	  memory; i.e., memory that is only accessible from the device (or
-	  group of devices). You likely also want to select HMM_MIRROR.
-
  config FRAME_VECTOR
  	bool

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