[PATCH v2] mm: introduce reference pages

[kernel test robot]

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 at intel.com>

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@lists.01.org
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