Re: [PATCH 2/2] mm: rename _count, field of the struct page, to _refcount

[kbuild test robot]

Hi Joonsoo,

[auto build test ERROR on net/master]
[also build test ERROR on v4.6-rc1 next-20160327]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/js1304-gmail-com/mm-page_ref-use-page_ref-helper-instead-of-direct-modification-of-_count/20160328-140113
config: i386-tinyconfig (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from include/linux/mm.h:25:0,
                    from include/linux/suspend.h:8,
                    from arch/x86/kernel/asm-offsets.c:12:
   include/linux/page_ref.h: In function 'page_ref_count':
>> include/linux/page_ref.h:66:26: error: 'struct page' has no member named '_count'
     return atomic_read(&page->_count);
                             ^
   include/linux/page_ref.h: In function 'page_count':
   include/linux/page_ref.h:71:41: error: 'struct page' has no member named '_count'
     return atomic_read(&compound_head(page)->_count);
                                            ^
   include/linux/page_ref.h: In function 'set_page_count':
   include/linux/page_ref.h:76:18: error: 'struct page' has no member named '_count'
     atomic_set(&page->_count, v);
                     ^
   include/linux/page_ref.h: In function 'page_ref_add':
   include/linux/page_ref.h:92:22: error: 'struct page' has no member named '_count'
     atomic_add(nr, &page->_count);
                         ^
   include/linux/page_ref.h: In function 'page_ref_sub':
   include/linux/page_ref.h:99:22: error: 'struct page' has no member named '_count'
     atomic_sub(nr, &page->_count);
                         ^
   include/linux/page_ref.h: In function 'page_ref_inc':
   include/linux/page_ref.h:106:18: error: 'struct page' has no member named '_count'
     atomic_inc(&page->_count);
                     ^
   include/linux/page_ref.h: In function 'page_ref_dec':
   include/linux/page_ref.h:113:18: error: 'struct page' has no member named '_count'
     atomic_dec(&page->_count);
                     ^
   include/linux/page_ref.h: In function 'page_ref_sub_and_test':
   include/linux/page_ref.h:120:41: error: 'struct page' has no member named '_count'
     int ret = atomic_sub_and_test(nr, &page->_count);
                                            ^
   include/linux/page_ref.h: In function 'page_ref_dec_and_test':
   include/linux/page_ref.h:129:37: error: 'struct page' has no member named '_count'
     int ret = atomic_dec_and_test(&page->_count);
                                        ^
   In file included from include/linux/atomic.h:4:0,
                    from include/linux/crypto.h:20,
                    from arch/x86/kernel/asm-offsets.c:8:
   include/linux/page_ref.h: In function 'page_ref_dec_return':
   include/linux/page_ref.h:138:35: error: 'struct page' has no member named '_count'
     int ret = atomic_dec_return(&page->_count);
                                      ^
   arch/x86/include/asm/atomic.h:172:53: note: in definition of macro 'atomic_dec_return'
    #define atomic_dec_return(v)  (atomic_sub_return(1, v))
                                                        ^
   In file included from include/linux/mm.h:25:0,
                    from include/linux/suspend.h:8,
                    from arch/x86/kernel/asm-offsets.c:12:
   include/linux/page_ref.h: In function 'page_ref_add_unless':
   include/linux/page_ref.h:147:35: error: 'struct page' has no member named '_count'
     int ret = atomic_add_unless(&page->_count, nr, u);
                                      ^
   In file included from arch/x86/include/asm/atomic.h:4:0,
                    from include/linux/atomic.h:4,
                    from include/linux/crypto.h:20,
                    from arch/x86/kernel/asm-offsets.c:8:
   include/linux/page_ref.h: In function 'page_ref_freeze':
   include/linux/page_ref.h:156:39: error: 'struct page' has no member named '_count'
     int ret = likely(atomic_cmpxchg(&page->_count, count, 0) == count);
                                          ^
   include/linux/compiler.h:169:40: note: in definition of macro 'likely'
    # define likely(x) __builtin_expect(!!(x), 1)
                                           ^
   In file included from include/linux/mm.h:25:0,
                    from include/linux/suspend.h:8,
                    from arch/x86/kernel/asm-offsets.c:12:
   include/linux/page_ref.h: In function 'page_ref_unfreeze':
   include/linux/page_ref.h:168:18: error: 'struct page' has no member named '_count'
     atomic_set(&page->_count, count);
                     ^
   make[2]: *** [arch/x86/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +66 include/linux/page_ref.h

95813b8f Joonsoo Kim 2016-03-17  60  }
95813b8f Joonsoo Kim 2016-03-17  61  
95813b8f Joonsoo Kim 2016-03-17  62  #endif
fe896d18 Joonsoo Kim 2016-03-17  63  
fe896d18 Joonsoo Kim 2016-03-17  64  static inline int page_ref_count(struct page *page)
fe896d18 Joonsoo Kim 2016-03-17  65  {
fe896d18 Joonsoo Kim 2016-03-17 @66  	return atomic_read(&page->_count);
fe896d18 Joonsoo Kim 2016-03-17  67  }
fe896d18 Joonsoo Kim 2016-03-17  68  
fe896d18 Joonsoo Kim 2016-03-17  69  static inline int page_count(struct page *page)

:::::: The code at line 66 was first introduced by commit
:::::: fe896d1878949ea92ba547587bc3075cc688fb8f mm: introduce page reference manipulation functions

:::::: TO: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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