Hi Peter, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [cannot apply to mmotm/master hnaz-linux-mm/master arm64/for-next/core tip/x86/asm v5.8 next-20200813] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Peter-Collingbourne/mm-introduce-reference-pages/20200814-061235 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dddcbc139e96bd18d8c65ef7b7e440f0d32457c2 config: x86_64-randconfig-a015-20200813 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 62ef1cb2079123b86878e4bfed3c14db448f1373) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): In file included from arch/x86/kernel/asm-offsets.c:9: In file included from include/linux/crypto.h:20: In file included from include/linux/slab.h:136: In file included from include/linux/kasan.h:14: >> include/linux/pgtable.h:1063:17: error: implicit declaration of function 'page_to_section' [-Werror,-Wimplicit-function-declaration] return pfn == page_to_pfn((struct page *)vma->vm_private_data); ^ include/asm-generic/memory_model.h:81:21: note: expanded from macro 'page_to_pfn' #define page_to_pfn __page_to_pfn ^ include/asm-generic/memory_model.h:64:14: note: expanded from macro '__page_to_pfn' int __sec = page_to_section(__pg); \ ^ include/linux/pgtable.h:1063:17: note: did you mean '__nr_to_section'? include/asm-generic/memory_model.h:81:21: note: expanded from macro 'page_to_pfn' #define page_to_pfn __page_to_pfn ^ include/asm-generic/memory_model.h:64:14: note: expanded from macro '__page_to_pfn' int __sec = page_to_section(__pg); \ ^ include/linux/mmzone.h:1220:35: note: '__nr_to_section' declared here static inline struct mem_section *__nr_to_section(unsigned long nr) ^ In file included from arch/x86/kernel/asm-offsets.c:13: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:28: In file included from include/linux/cgroup-defs.h:22: In file included from include/linux/bpf-cgroup.h:5: In file included from include/linux/bpf.h:21: In file included from include/linux/kallsyms.h:12: >> include/linux/mm.h:1444:29: error: static declaration of 'page_to_section' follows non-static declaration static inline unsigned long page_to_section(const struct page *page) ^ include/linux/pgtable.h:1063:17: note: previous implicit declaration is here return pfn == page_to_pfn((struct page *)vma->vm_private_data); ^ include/asm-generic/memory_model.h:81:21: note: expanded from macro 'page_to_pfn' #define page_to_pfn __page_to_pfn ^ include/asm-generic/memory_model.h:64:14: note: expanded from macro '__page_to_pfn' int __sec = page_to_section(__pg); \ ^ 2 errors generated. make[2]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1203: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:185: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +/page_to_section +1063 include/linux/pgtable.h 1056 1057 static inline int is_zero_or_refpage_pfn(struct vm_area_struct *vma, 1058 unsigned long pfn) 1059 { 1060 if (is_zero_pfn(pfn)) 1061 return true; 1062 if (unlikely(!vma->vm_ops && vma->vm_private_data)) > 1063 return pfn == page_to_pfn((struct page *)vma->vm_private_data); 1064 return false; 1065 } 1066 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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