linux-kernel - [PATCH] fbdev: simplefb: limit its use to DRM

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Message-Id: <20210719023327.17039-1-rdunlap@infradead.org>
Date:   Sun, 18 Jul 2021 19:33:27 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH] fbdev: simplefb: limit its use to DRM_SIMPLEDRM=n

When DRM_SIMPLEDRM=m, all of FB_CFB_{FILLRECT,COPYAREA,IMAGEBLIT} are =m,
causing undefined references in fbdev/simplefb.o.

By restricting FB_SIMPLEFB to be set only when DRM_SIMPLEDRM is not set,
the FB_CFB_* symbols are =y and the build completes without these
undefined references.

IOW, really "disable simplefb if simpledrm has been selected".

or1k-linux-ld: drivers/video/fbdev/simplefb.o:(.rodata+0x2c): undefined reference to `cfb_fillrect'
or1k-linux-ld: drivers/video/fbdev/simplefb.o:(.rodata+0x30): undefined reference to `cfb_copyarea'
or1k-linux-ld: drivers/video/fbdev/simplefb.o:(.rodata+0x34): undefined reference to `cfb_imageblit'

Fixes: 11e8f5fd223b ("drm: Add simpledrm driver")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: kernel test robot <lkp@...el.com>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: linux-fbdev@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: Thomas Zimmermann <tzimmermann@...e.de>
---
 drivers/video/fbdev/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20210716.orig/drivers/video/fbdev/Kconfig
+++ linux-next-20210716/drivers/video/fbdev/Kconfig
@@ -2192,7 +2192,7 @@ config FB_HYPERV
 
 config FB_SIMPLE
 	bool "Simple framebuffer support"
-	depends on (FB = y) && !DRM_SIMPLEDRM
+	depends on (FB = y) && DRM_SIMPLEDRM=n
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT