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    SubjectRe: arch/powerpc/mm/book3s64/pgtable.c:174:15: error: no previous prototype for 'create_section_mapping'
    On Mon, Nov 23, 2020 at 6:13 PM kernel test robot <lkp@intel.com> wrote:
    >
    > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
    > head: d5beb3140f91b1c8a3d41b14d729aefa4dcc58bc
    > commit: a927bd6ba952d13c52b8b385030943032f659a3e mm: fix phys_to_target_node() and memory_add_physaddr_to_nid() exports
    > date: 31 hours ago
    > config: powerpc-randconfig-r024-20201123 (attached as .config)
    > compiler: powerpc64le-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
    > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a927bd6ba952d13c52b8b385030943032f659a3e
    > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
    > git fetch --no-tags linus master
    > git checkout a927bd6ba952d13c52b8b385030943032f659a3e
    > # save the attached .config to linux build tree
    > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc
    >
    > If you fix the issue, kindly add following tag as appropriate
    > Reported-by: kernel test robot <lkp@intel.com>
    >
    > All errors (new ones prefixed by >>):
    >
    > >> arch/powerpc/mm/book3s64/pgtable.c:174:15: error: no previous prototype for 'create_section_mapping' [-Werror=missing-prototypes]
    > 174 | int __meminit create_section_mapping(unsigned long start, unsigned long end,
    > | ^~~~~~~~~~~~~~~~~~~~~~
    > arch/powerpc/mm/book3s64/pgtable.c:405:6: error: no previous prototype for 'arch_report_meminfo' [-Werror=missing-prototypes]
    > 405 | void arch_report_meminfo(struct seq_file *m)
    > | ^~~~~~~~~~~~~~~~~~~
    > arch/powerpc/mm/book3s64/pgtable.c:461:5: error: no previous prototype for 'pmd_move_must_withdraw' [-Werror=missing-prototypes]
    > 461 | int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
    > | ^~~~~~~~~~~~~~~~~~~~~~
    > cc1: all warnings being treated as errors
    >
    > vim +/create_section_mapping +174 arch/powerpc/mm/book3s64/pgtable.c

    The whack-a-mole continues... the kbuild-robot success report I
    received gave me too much confidence.

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