Re: [PATCH 1/3] perf/core: Provide a kernel-internal interface to recalibrate event period

[kbuild test robot]

Hi Like,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kvm/linux-next]
[cannot apply to v5.4-rc1 next-20190930]
[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/Like-Xu/perf-core-Provide-a-kernel-internal-interface-to-recalibrate-event-period/20191001-081543
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: sh-rsk7269_defconfig (attached as .config)
compiler: sh4-linux-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=sh 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   kernel/events/core.o: In function `_perf_ioctl':
>> core.c:(.text+0x7068): undefined reference to `__get_user_unknown'

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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