tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: fb893de323e2d39f7a1f6df425703a2edbdf56ea commit: d9e8b929670b4f79e07cdbcb0fb4f162a561d5c6 asm-generic: pgalloc: provide generic pud_alloc_one() and pud_free_one() date: 5 days ago config: mips-randconfig-p001-20200812 (attached as .config) compiler: mips64-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 d9e8b929670b4f79e07cdbcb0fb4f162a561d5c6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/mips/mm/init.c:43: 81 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) | ^~~~~~~~~~~~~ In file included from arch/mips/include/asm/pgalloc.h:18, from arch/mips/mm/init.c:43: include/asm-generic/pgalloc.h:160:22: note: previous definition of 'pud_alloc_one' was here 160 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | ^~~~~~~~~~~~~ arch/mips/mm/init.c:61:6: warning: no previous prototype for 'setup_zero_pages' [-Wmissing-prototypes] 61 | void setup_zero_pages(void) | ^~~~~~~~~~~~~~~~ -- In file included from arch/mips/mm/pgtable.c:9: 81 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) | ^~~~~~~~~~~~~ In file included from arch/mips/include/asm/pgalloc.h:18, from arch/mips/mm/pgtable.c:9: include/asm-generic/pgalloc.h:160:22: note: previous definition of 'pud_alloc_one' was here 160 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | ^~~~~~~~~~~~~ -- In file included from arch/mips/mm/pgtable-64.c:13: 81 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) | ^~~~~~~~~~~~~ In file included from arch/mips/include/asm/pgalloc.h:18, from arch/mips/mm/pgtable-64.c:13: include/asm-generic/pgalloc.h:160:22: note: previous definition of 'pud_alloc_one' was here 160 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | ^~~~~~~~~~~~~ arch/mips/mm/pgtable-64.c:90:7: warning: no previous prototype for 'mk_pmd' [-Wmissing-prototypes] 90 | pmd_t mk_pmd(struct page *page, pgprot_t prot) | ^~~~~~ arch/mips/mm/pgtable-64.c:99:6: warning: no previous prototype for 'set_pmd_at' [-Wmissing-prototypes] 99 | void set_pmd_at(struct mm_struct *mm, unsigned long addr, | ^~~~~~~~~~ vim +/pud_alloc_one +81 arch/mips/include/asm/pgalloc.h 3377e227af441a Alex Belits 2017-02-16 80 3377e227af441a Alex Belits 2017-02-16 @81 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) 3377e227af441a Alex Belits 2017-02-16 82 { 3377e227af441a Alex Belits 2017-02-16 83 pud_t *pud; 3377e227af441a Alex Belits 2017-02-16 84 473738eb78c3e3 Michal Hocko 2017-07-12 85 pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER); 3377e227af441a Alex Belits 2017-02-16 86 if (pud) 3377e227af441a Alex Belits 2017-02-16 87 pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table); 3377e227af441a Alex Belits 2017-02-16 88 return pud; 3377e227af441a Alex Belits 2017-02-16 89 } 3377e227af441a Alex Belits 2017-02-16 90 :::::: The code at line 81 was first introduced by commit :::::: 3377e227af441aff710726437adc20efc359fd9c MIPS: Add 48-bit VA space (and 4-level page tables) for 4K pages. :::::: TO: Alex Belits <alex.belits(a)cavium.com&gt; :::::: CC: Ralf Baechle <ralf(a)linux-mips.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org