Hi Dan,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc3]
[cannot apply to next-20180704]
[if your patch is applied to the wrong git tree, please drop us a note to help 
improve the system]

url:    
https://github.com/0day-ci/linux/commits/Dan-Williams/device-dax-Convert-to-vmf_insert_mixed-and-vm_fault_t/20180705-075150
config: x86_64-acpi-redef (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   In file included from fs/ext2/file.c:24:0:
   include/linux/dax.h: In function 'dax_lock_mapping_entry':
>> include/linux/dax.h:128:15: error: 'page' redeclared as different kind of 
>> symbol
     struct page *page = pfn_to_page(pfn);
                  ^~~~
   include/linux/dax.h:126:56: note: previous definition of 'page' was here
    static inline bool dax_lock_mapping_entry(struct page *page)
                                                           ^~~~
   In file included from arch/x86/include/asm/page.h:76:0,
                    from arch/x86/include/asm/thread_info.h:12,
                    from include/linux/thread_info.h:38,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:81,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from fs/ext2/file.c:22:
>> include/linux/dax.h:128:34: error: 'pfn' undeclared (first use in this 
>> function); did you mean '__pfn'?
     struct page *page = pfn_to_page(pfn);
                                     ^
   include/asm-generic/memory_model.h:69:27: note: in definition of macro 
'__pfn_to_page'
    ({ unsigned long __pfn = (pfn);   \
                              ^~~
   include/linux/dax.h:128:22: note: in expansion of macro 'pfn_to_page'
     struct page *page = pfn_to_page(pfn);
                         ^~~~~~~~~~~
   include/linux/dax.h:128:34: note: each undeclared identifier is reported 
only once for each function it appears in
     struct page *page = pfn_to_page(pfn);
                                     ^
   include/asm-generic/memory_model.h:69:27: note: in definition of macro 
'__pfn_to_page'
    ({ unsigned long __pfn = (pfn);   \
                              ^~~
   include/linux/dax.h:128:22: note: in expansion of macro 'pfn_to_page'
     struct page *page = pfn_to_page(pfn);
                         ^~~~~~~~~~~
   In file included from fs/ext2/file.c:24:0:
   include/linux/dax.h: In function 'dax_lock_page':
>> include/linux/dax.h:141:1: warning: no return statement in function 
>> returning non-void [-Wreturn-type]
    }
    ^

vim +/page +128 include/linux/dax.h

   124  
   125  
   126  static inline bool dax_lock_mapping_entry(struct page *page)
   127  {
 > 128          struct page *page = pfn_to_page(pfn);
   129  
   130          if (IS_DAX(page->mapping->host))
   131                  return true;
   132          return false;
   133  }
   134  
   135  void dax_unlock_mapping_entry(struct page *page)
   136  {
   137  }
   138  
   139  static inline struct page *dax_lock_page(unsigned long pfn)
   140  {
 > 141  }
   142  

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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