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    SubjectRe: [PATCH] memcg: Replace mm->owner with mm->memcg
    On Sun, 6 May 2018 00:54:48 +0800 kbuild test robot <lkp@intel.com> wrote:

    > Hi Eric,
    >
    > Thank you for the patch! Yet something to improve:
    >
    > [auto build test ERROR on linus/master]
    > [also build test ERROR on v4.17-rc3]
    > [cannot apply to next-20180504]
    > [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
    >
    > url: https://github.com/0day-ci/linux/commits/Eric-W-Biederman/memcg-Replace-mm-owner-with-mm-memcg/20180503-120054
    > config: xtensa-nommu_kc705_defconfig (attached as .config)
    > compiler: xtensa-de212-elf-gcc (crosstool-NG crosstool-ng-1.23.0-307-g452ee331) 7.3.0
    > 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
    > make.cross ARCH=xtensa
    >
    > All errors (new ones prefixed by >>):
    >
    > kernel/fork.o: In function `sighand_ctor':
    > >> fork.c:(.text+0x3b0): undefined reference to `mm_update_memcg'
    > kernel/fork.o: In function `mmdrop_async':
    > fork.c:(.text+0x43a): undefined reference to `mm_update_memcg'
    > kernel/fork.o: In function `set_task_stack_end_magic':
    > fork.c:(.text+0x752): undefined reference to `mm_update_memcg'

    Due to the combination of CONFIG_MMU=n and CONFIG_MEMCG=y.
    mm/memcontrol.c's mm_update_memcg() depends upon CONFIG_MMU=y.

    Is this a valid conbination? Do we actually support (and test!) memcg
    on nommu systems?

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