tree: git://git.infradead.org/users/willy/pagecache for-next head: c267b33d0001488f1d9dad12d6a87655e174d914 commit: 2cefeaf011db4a95ecb515cc2ca61d091a792ac1 [58/85] mm/rmap: Turn page_mlock() into folio_mlock() config: h8300-alldefconfig (https://download.01.org/0day-ci/archive/20220214/202202142352.7A4VgqBz-lk...) compiler: h8300-linux-gcc (GCC) 11.2.0 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 remote add willy-pagecache git://git.infradead.org/users/willy/pagecache git fetch --no-tags willy-pagecache for-next git checkout 2cefeaf011db4a95ecb515cc2ca61d091a792ac1 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=h8300 SHELL=/bin/bash 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 >>): mm/folio-compat.c:169:6: warning: no previous prototype for 'clear_page_mlock' [-Wmissing-prototypes] 169 | void clear_page_mlock(struct page *page) | ^~~~~~~~~~~~~~~~ mm/folio-compat.c:174:6: error: redefinition of 'mlock_vma_page' 174 | void mlock_vma_page(struct page *page) | ^~~~~~~~~~~~~~ In file included from mm/folio-compat.c:11: mm/internal.h:503:20: note: previous definition of 'mlock_vma_page' with type 'void(struct page *)' 503 | static inline void mlock_vma_page(struct page *page) { } | ^~~~~~~~~~~~~~ mm/folio-compat.c: In function 'mlock_vma_page': mm/folio-compat.c:176:9: error: implicit declaration of function 'mlock_vma_folio'; did you mean 'mlock_vma_page'? [-Werror=implicit-function-declaration] 176 | mlock_vma_folio(page_folio(page)); | ^~~~~~~~~~~~~~~ | mlock_vma_page mm/folio-compat.c: At top level: mm/folio-compat.c:179:6: warning: no previous prototype for 'page_mlock' [-Wmissing-prototypes] 179 | void page_mlock(struct page *page) | ^~~~~~~~~~ mm/folio-compat.c: In function 'page_mlock': 181 | folio_mlock(page_folio(page)); | ^~~~~~~~~~~ | folio_lock cc1: some warnings being treated as errors vim +181 mm/folio-compat.c 178 179 void page_mlock(struct page *page) 180 { --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org