linux-kernel - [PATCH] vfio-mdev: add back CONFIG

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Date:   Thu, 26 Jan 2023 17:37:06 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Tony Krowiak <akrowiak@...ux.ibm.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        Finn Behrens <me@...enk.de>, Miguel Ojeda <ojeda@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] vfio-mdev: add back CONFIG_VFIO dependency

From: Arnd Bergmann <arnd@...db.de>

CONFIG_VFIO_MDEV cannot be selected when VFIO itself is
disabled, otherwise we get a link failure:

WARNING: unmet direct dependencies detected for VFIO_MDEV
  Depends on [n]: VFIO [=n]
  Selected by [y]:
  - SAMPLE_VFIO_MDEV_MTTY [=y] && SAMPLES [=y]
  - SAMPLE_VFIO_MDEV_MDPY [=y] && SAMPLES [=y]
  - SAMPLE_VFIO_MDEV_MBOCHS [=y] && SAMPLES [=y]
/home/arnd/cross/arm64/gcc-13.0.1-nolibc/x86_64-linux/bin/x86_64-linux-ld: samples/vfio-mdev/mdpy.o: in function `mdpy_remove':
mdpy.c:(.text+0x1e1): undefined reference to `vfio_unregister_group_dev'
/home/arnd/cross/arm64/gcc-13.0.1-nolibc/x86_64-linux/bin/x86_64-linux-ld: samples/vfio-mdev/mdpy.o: in function `mdpy_probe':
mdpy.c:(.text+0x149e): undefined reference to `_vfio_alloc_device'

Fixes: 8bf8c5ee1f38 ("vfio-mdev: turn VFIO_MDEV into a selectable symbol")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 samples/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/samples/Kconfig b/samples/Kconfig
index 56b191d128d8..44a09dfa8a0b 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -185,6 +185,7 @@ config SAMPLE_UHID
 
 config SAMPLE_VFIO_MDEV_MTTY
 	tristate "Build VFIO mtty example mediated device sample code"
+	depends on VFIO
 	select VFIO_MDEV
 	help
 	  Build a virtual tty sample driver for use as a VFIO
@@ -192,6 +193,7 @@ config SAMPLE_VFIO_MDEV_MTTY
 
 config SAMPLE_VFIO_MDEV_MDPY
 	tristate "Build VFIO mdpy example mediated device sample code"
+	depends on VFIO
 	select VFIO_MDEV
 	help
 	  Build a virtual display sample driver for use as a VFIO
@@ -209,6 +211,7 @@ config SAMPLE_VFIO_MDEV_MDPY_FB
 
 config SAMPLE_VFIO_MDEV_MBOCHS
 	tristate "Build VFIO mdpy example mediated device sample code"
+	depends on VFIO
 	select VFIO_MDEV
 	select DMA_SHARED_BUFFER
 	help
-- 
2.39.0