[PATCH AUTOSEL 4.19 120/177] xen/gntdev: Use select for DMA_SHARED_BUFFER

Sasha Levin
2019-12-10T21:39:19Z

From: Jason Gunthorpe <jgg@mellanox.com>

[ Upstream commit fa6614d8ef13c63aac52ad7c07c5e69ce4aba3dd ]

DMA_SHARED_BUFFER can not be enabled by the user (it represents a library
set in the kernel). The kconfig convention is to use select for such
symbols so they are turned on implicitly when the user enables a kconfig
that needs them.

Otherwise the XEN_GNTDEV_DMABUF kconfig is overly difficult to enable.

Fixes: 932d6562179e ("xen/gntdev: Add initial support for dma-buf UAPI")
Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: xen-devel@lists.xenproject.org
Cc: Juergen Gross <jgross@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/xen/Kconfig | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 90d387b50ab74..0505eeb593b5c 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -158,7 +158,8 @@ config XEN_GNTDEV

config XEN_GNTDEV_DMABUF
bool "Add support for dma-buf grant access device driver extension"
- depends on XEN_GNTDEV && XEN_GRANT_DMA_ALLOC && DMA_SHARED_BUFFER
+ depends on XEN_GNTDEV && XEN_GRANT_DMA_ALLOC
+ select DMA_SHARED_BUFFER
help
Allows userspace processes and kernel modules to use Xen backed
dma-buf implementation. With this extension grant references to
--
2.20.1