linux-kernel - Re: [kbuild-all] Re: undefined reference to `start_isolate_page

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Date:   Tue, 8 Sep 2020 06:45:39 +0800
From:   Philip Li <philip.li@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     kernel test robot <lkp@...el.com>, Michal Simek <monstr@...str.eu>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>, Mike Rapoport <rppt@...nel.org>
Subject: Re: [kbuild-all] Re: undefined reference to
 `start_isolate_page_range'

On Mon, Sep 07, 2020 at 03:40:08PM -0700, Randy Dunlap wrote:
> 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.  :)
Hi Randy, thanks for the input, below warning is helpful to identify
issues, we will add this to plan to show kconfig related warnings
in the report.

Thanks

> 
> 
> 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
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