Hi Joonsoo, [auto build test WARNING on net/master] [also build test WARNING 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: x86_64-randconfig-x019-201613 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (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:138:43: note: in definition of macro 'likely' # define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1)) ^ 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:138:51: note: in definition of macro 'likely' # define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1)) ^ 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:114:47: note: in definition of macro 'likely_notrace' #define likely_notrace(x) __builtin_expect(!!(x), 1) ^ include/linux/compiler.h:138:56: note: in expansion of macro '__branch_check__' # define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1)) ^ >> include/linux/page_ref.h:156:12: note: in expansion of macro 'likely' int ret = likely(atomic_cmpxchg(&page->_count, count, 0) == count); ^ 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 +/likely +156 include/linux/page_ref.h 95813b8f Joonsoo Kim 2016-03-17 140 if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return)) 95813b8f Joonsoo Kim 2016-03-17 141 __page_ref_mod_and_return(page, -1, ret); 95813b8f Joonsoo Kim 2016-03-17 142 return ret; fe896d18 Joonsoo Kim 2016-03-17 143 } fe896d18 Joonsoo Kim 2016-03-17 144 fe896d18 Joonsoo Kim 2016-03-17 145 static inline int page_ref_add_unless(struct page *page, int nr, int u) fe896d18 Joonsoo Kim 2016-03-17 146 { 95813b8f Joonsoo Kim 2016-03-17 147 int ret = atomic_add_unless(&page->_count, nr, u); 95813b8f Joonsoo Kim 2016-03-17 148 95813b8f Joonsoo Kim 2016-03-17 149 if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_unless)) 95813b8f Joonsoo Kim 2016-03-17 150 __page_ref_mod_unless(page, nr, ret); 95813b8f Joonsoo Kim 2016-03-17 151 return ret; fe896d18 Joonsoo Kim 2016-03-17 152 } fe896d18 Joonsoo Kim 2016-03-17 153 fe896d18 Joonsoo Kim 2016-03-17 154 static inline int page_ref_freeze(struct page *page, int count) fe896d18 Joonsoo Kim 2016-03-17 155 { 95813b8f Joonsoo Kim 2016-03-17 @156 int ret = likely(atomic_cmpxchg(&page->_count, count, 0) == count); 95813b8f Joonsoo Kim 2016-03-17 157 95813b8f Joonsoo Kim 2016-03-17 158 if (page_ref_tracepoint_active(__tracepoint_page_ref_freeze)) 95813b8f Joonsoo Kim 2016-03-17 159 __page_ref_freeze(page, count, ret); 95813b8f Joonsoo Kim 2016-03-17 160 return ret; fe896d18 Joonsoo Kim 2016-03-17 161 } fe896d18 Joonsoo Kim 2016-03-17 162 fe896d18 Joonsoo Kim 2016-03-17 163 static inline void page_ref_unfreeze(struct page *page, int count) fe896d18 Joonsoo Kim 2016-03-17 164 { :::::: The code at line 156 was first introduced by commit :::::: 95813b8faa0cd315f61a8b9d9c523792370b693e mm/page_ref: add tracepoint to track down page reference manipulation :::::: TO: Joonsoo Kim <[email protected]> :::::: CC: Linus Torvalds <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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