linux-kernel - [PATCH] [v2] accel: fix CONFIG

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Date:   Fri, 27 Jan 2023 23:14:55 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Oded Gabbay <ogabbay@...nel.org>, Dave Airlie <airlied@...hat.com>,
        Melissa Wen <mwen@...lia.com>,
        Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
        Jeffrey Hugo <quic_jhugo@...cinc.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] accel: fix CONFIG_DRM dependencies

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

At the moment, accel drivers can be built-in even with CONFIG_DRM=m,
but this causes a link failure:

x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_dev_init':
ivpu_drv.c:(.text+0x1535): undefined reference to `drmm_kmalloc'
x86_64-linux-ld: ivpu_drv.c:(.text+0x1562): undefined reference to `drmm_kmalloc'
x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_remove':
ivpu_drv.c:(.text+0x1faa): undefined reference to `drm_dev_unregister'
x86_64-linux-ld: drivers/accel/ivpu/ivpu_drv.o: in function `ivpu_probe':
ivpu_drv.c:(.text+0x1fef): undefined reference to `__devm_drm_dev_alloc'

The problem is that DRM_ACCEL is a 'bool' symbol symbol, so driver that
only depend on DRM_ACCEL but not also on DRM do not see the restriction
to =m configs.

To ensure that each accel driver has an implied dependency on CONFIG_DRM,
enclose the entire Kconfig file in an if/endif check.

Fixes: 8bf4889762a8 ("drivers/accel: define kconfig and register a new major")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: rearrage the DRM dependency rather than requiring DRM to be built-in
---
 drivers/accel/Kconfig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/accel/Kconfig b/drivers/accel/Kconfig
index 834863902e16..c437206aa3f1 100644
--- a/drivers/accel/Kconfig
+++ b/drivers/accel/Kconfig
@@ -6,9 +6,10 @@
 # as, but not limited to, Machine-Learning and Deep-Learning acceleration
 # devices
 #
+if DRM
+
 menuconfig DRM_ACCEL
 	bool "Compute Acceleration Framework"
-	depends on DRM
 	help
 	  Framework for device drivers of compute acceleration devices, such
 	  as, but not limited to, Machine-Learning and Deep-Learning
@@ -25,3 +26,5 @@ menuconfig DRM_ACCEL
 
 source "drivers/accel/habanalabs/Kconfig"
 source "drivers/accel/ivpu/Kconfig"
+
+endif
-- 
2.39.0