Re: [PATCH v5 07/11] filesystem-dax: Introduce dax_lock_mapping_entry()

[kbuild test robot]

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	

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