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From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     linux-mm@kvack.org, Ralph Campbell <rcampbell@nvidia.com>
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Subject: [PATCH hmm v2 1/5] mm/hmm: make CONFIG_DEVICE_PRIVATE into a select
Date:   Fri,  1 May 2020 15:20:44 -0300
Message-Id: <1-v2-b4e84f444c7d+24f57-hmm_no_flags_jgg@mellanox.com>
In-Reply-To: <0-v2-b4e84f444c7d+24f57-hmm_no_flags_jgg@mellanox.com>
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From: Jason Gunthorpe <jgg@mellanox.com>

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.

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@amd.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
 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
 
-- 
2.26.2