Hi Chen, It's probably a bug fix that unveils the link errors.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 2a26d99b251b8625d27aed14e97fc10707a3a81f commit: f69405ce6c0fc9f4a039011007371b31f80b470d openrisc: include: asm: Kbuild: add default "vga.h" date: 3 years ago config: openrisc-alldefconfig (attached as .config) compiler: or32-linux-gcc (GCC) 4.5.1-or32-1.0rc1 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout f69405ce6c0fc9f4a039011007371b31f80b470d # save the attached .config to linux build tree make.cross ARCH=openrisc All errors (new ones prefixed by >>): drivers/built-in.o: In function `vgacon_save_screen': >> vgacon.c:(.text+0x20e0): undefined reference to `screen_info' vgacon.c:(.text+0x20e8): undefined reference to `screen_info' drivers/built-in.o: In function `vgacon_init': vgacon.c:(.text+0x284c): undefined reference to `screen_info' vgacon.c:(.text+0x2850): undefined reference to `screen_info' drivers/built-in.o: In function `vgacon_startup': vgacon.c:(.text+0x28d8): undefined reference to `screen_info' drivers/built-in.o:vgacon.c:(.text+0x28f0): more undefined references to `screen_info' follow --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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