linux-kernel - [PATCH 4.19 135/219] xen/gntdev: Use select for DMA_SHARED

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Date:   Sun, 29 Dec 2019 18:18:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 135/219] xen/gntdev: Use select for DMA_SHARED_BUFFER

From: Jason Gunthorpe <jgg@...lanox.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@...m.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: xen-devel@...ts.xenproject.org
Cc: Juergen Gross <jgross@...e.com>
Cc: Stefano Stabellini <sstabellini@...nel.org>
Reviewed-by: Juergen Gross <jgross@...e.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/xen/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 90d387b50ab7..0505eeb593b5 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