linux-kernel - Re: ld.lld: error: undefined symbol: omap_set_dma

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Date:   Sun, 10 Jul 2022 17:21:55 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>, Arnd Bergmann <arnd@...db.de>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-fbdev@...r.kernel.org
Subject: Re: ld.lld: error: undefined symbol: omap_set_dma_priority



On 7/7/22 12:17, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   e8a4e1c1bb697b1d9fc48f0e56dc0f50bc024bee
> commit: 7036440eab3e2d47a775d4616909f8235488d714 ARM: omap1: enable multiplatform
> date:   5 weeks ago
> config: arm-randconfig-r035-20220706 (https://download.01.org/0day-ci/archive/20220708/202207080322.DnumSqh8-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project f553287b588916de09c66e3e32bf75e5060f967f)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm cross compiling tool for clang build
>         # apt-get install binutils-arm-linux-gnueabi
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7036440eab3e2d47a775d4616909f8235488d714
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 7036440eab3e2d47a775d4616909f8235488d714
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>>> ld.lld: error: undefined symbol: omap_set_dma_priority
>    >>> referenced by omapfb_main.c:1706 (drivers/video/fbdev/omap/omapfb_main.c:1706)
>    >>>               video/fbdev/omap/omapfb_main.o:(omapfb_do_probe) in archive drivers/built-in.a

(also happens with gcc)

Discrepancy between arch/arm/Kconfig and arch/arm/mach-omap1/{Kconfig,Makefile},
drivers/video/fbdev/omap/Kconfig, and <linux/omap-dma.h>.

Kernel .config has

CONFIG_ARCH_OMAP1=y
# CONFIG_ARCH_OMAP730 is not set
# CONFIG_ARCH_OMAP850 is not set
# CONFIG_ARCH_OMAP16XX is not set
CONFIG_ARCH_OMAP=y

FB_OMAP_DMA_TUNE depends on FB_OMAP, which
depends on ARCH_OMAP1 || (ARM && COMPILE_TEST), all of which are 'y'.

<linux/omap-dma.h> expects omap_set_dma_priority() to be defined
elsewhere (not inline) for this .config:

#if defined(CONFIG_ARCH_OMAP1)
extern void omap_set_dma_priority(int lch, int dst_port, int priority);
#else
static inline void omap_set_dma_priority(int lch, int dst_port, int priority)
{
}
#endif

but arch/arm/mach-omap1/Makefile only builds omap-dma.o for
ifdef CONFIG_ARCH_OMAP1_ANY, which is not set.


-- 
~Randy