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Subject: Re: [PATCH 07/19] mm/gup: introduce pin_user_pages*() and FOLL_PIN
To:     kbuild test robot <lkp@intel.com>
CC:     <kbuild-all@lists.01.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>, Jan Kara <jack@suse.cz>,
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References: <20191125042011.3002372-8-jhubbard@nvidia.com>
 <201911251639.UWS3hE3Y%lkp@intel.com>
From:   John Hubbard <jhubbard@nvidia.com>
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On 11/25/19 12:44 AM, kbuild test robot wrote:
> Hi John,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on rdma/for-next]
> [cannot apply to v5.4 next-20191122]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
> 
> url:    https://github.com/0day-ci/linux/commits/John-Hubbard/pin_user_pages-reduced-risk-series-for-Linux-5-5/20191125-125637
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next
> config: arm-randconfig-a001-20191125 (attached as .config)
> compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         GCC_VERSION=7.4.0 make.cross ARCH=arm 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>    mm/gup.o: In function `pin_user_pages_remote':
>>> mm/gup.c:2528: undefined reference to `get_user_pages_remote'
> 
> vim +2528 mm/gup.c


This, and the other (sh) report, is due to !CONFIG_MMU lacking a get_user_pages_remote(), 
but pin_user_pages_remote() needs it for a (temporary) implementation. I'll post the fix, 
in v2.


thanks,
-- 
John Hubbard
NVIDIA