linux-kernel - Re: undefined reference to `start_isolate_page

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Date:   Mon, 7 Sep 2020 15:40:08 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>, Michal Simek <monstr@...str.eu>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>, Mike Rapoport <rppt@...nel.org>
Subject: Re: undefined reference to `start_isolate_page_range'

Hi lkp, (or is it ktr?)

This is sort of a shame-on-you post. As a robot, I hope that you
don't have any hard feelings about it.  :)


On 9/6/20 9:17 AM, kernel test robot wrote:
> Hi Michal,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   dd9fb9bb3340c791a2be106fdc895db75f177343
> commit: 2602276d3d3811b1a48c48113042cd75fcbfc27d microblaze: Wire CMA allocator
> date:   7 months ago
> config: microblaze-randconfig-r021-20200906 (attached as .config)
> compiler: microblaze-linux-gcc (GCC) 9.3.0
> 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
>         git checkout 2602276d3d3811b1a48c48113042cd75fcbfc27d
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=microblaze 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    microblaze-linux-ld: mm/page_alloc.o: in function `alloc_contig_range':
>>> (.text+0x10c8c): undefined reference to `start_isolate_page_range'
>>> microblaze-linux-ld: (.text+0x10f14): undefined reference to `test_pages_isolated'
>>> microblaze-linux-ld: (.text+0x10fd0): undefined reference to `undo_isolate_page_range'

When I (easily) reproduce this build error, I also see a Kconfig warning:
(or the same warning repeated 3 times)

WARNING: unmet direct dependencies detected for CMA
  Depends on [n]: MMU [=n]
  Selected by [m]:
  - DRM_ASPEED_GFX [=m] && HAS_IOMEM [=y] && DRM [=m] && OF [=y] && (COMPILE_TEST [=y] || ARCH_ASPEED) && HAVE_DMA_CONTIGUOUS [=y]

WARNING: unmet direct dependencies detected for CMA
  Depends on [n]: MMU [=n]
  Selected by [m]:
  - DRM_ASPEED_GFX [=m] && HAS_IOMEM [=y] && DRM [=m] && OF [=y] && (COMPILE_TEST [=y] || ARCH_ASPEED) && HAVE_DMA_CONTIGUOUS [=y]

WARNING: unmet direct dependencies detected for CMA
  Depends on [n]: MMU [=n]
  Selected by [m]:
  - DRM_ASPEED_GFX [=m] && HAS_IOMEM [=y] && DRM [=m] && OF [=y] && (COMPILE_TEST [=y] || ARCH_ASPEED) && HAVE_DMA_CONTIGUOUS [=y]


This is the cause of the build errors.
You shouldn't omit Kconfig warnings from your reports.

> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org


cheers.
-- 
~Randy