[linux-next:master 5933/6583] include/asm-generic/memory_model.h:47:21: error: implicit declaration of function 'page_to_section'; did you mean 'present_section'?

[linux-next:master 5933/6583] include/asm-generic/memory_model.h:47:21: error: implicit declaration of function 'page_to_section'; did you mean 'present_section'?

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   8433c776e1eb1371f5cd40b5fd3a61f9c7b7f3ad
commit: a2d6e9c1a867bb9f13943cb8483e2ab85b630bcd [5933/6583] mm: page_ext: add an iteration API for page extensions
config: i386-buildonly-randconfig-001-20250226 (https://download.01.org/0day-ci/archive/20250226/202502261825.F56aq7iS-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250226/202502261825.F56aq7iS-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502261825.F56aq7iS-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/x86/include/asm/page.h:89,
                    from arch/x86/include/asm/thread_info.h:12,
                    from include/linux/thread_info.h:60,
                    from include/linux/spinlock.h:60,
                    from include/linux/swait.h:7,
                    from include/linux/completion.h:12,
                    from include/linux/crypto.h:15,
                    from arch/x86/kernel/asm-offsets.c:9:
   include/linux/page_ext.h: In function 'page_ext_iter_begin':
>> include/asm-generic/memory_model.h:47:21: error: implicit declaration of function 'page_to_section'; did you mean 'present_section'? [-Werror=implicit-function-declaration]
      47 |         int __sec = page_to_section(__pg);                      \
         |                     ^~~~~~~~~~~~~~~
   include/asm-generic/memory_model.h:64:21: note: in expansion of macro '__page_to_pfn'
      64 | #define page_to_pfn __page_to_pfn
         |                     ^~~~~~~~~~~~~
   include/linux/page_ext.h:131:27: note: in expansion of macro 'page_to_pfn'
     131 |         iter->start_pfn = page_to_pfn(page);
         |                           ^~~~~~~~~~~
   In file included from include/linux/memcontrol.h:21,
                    from include/linux/swap.h:9,
                    from include/linux/suspend.h:5,
                    from arch/x86/kernel/asm-offsets.c:14:
   include/linux/mm.h: At top level:
>> include/linux/mm.h:1965:29: error: conflicting types for 'page_to_section'; have 'long unsigned int(const struct page *)'
    1965 | static inline unsigned long page_to_section(const struct page *page)
         |                             ^~~~~~~~~~~~~~~
   include/asm-generic/memory_model.h:47:21: note: previous implicit declaration of 'page_to_section' with type 'int()'
      47 |         int __sec = page_to_section(__pg);                      \
         |                     ^~~~~~~~~~~~~~~
   include/asm-generic/memory_model.h:64:21: note: in expansion of macro '__page_to_pfn'
      64 | #define page_to_pfn __page_to_pfn
         |                     ^~~~~~~~~~~~~
   include/linux/page_ext.h:131:27: note: in expansion of macro 'page_to_pfn'
     131 |         iter->start_pfn = page_to_pfn(page);
         |                           ^~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[3]: *** [scripts/Makefile.build:102: arch/x86/kernel/asm-offsets.s] Error 1 shuffle=1418848070
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1264: prepare0] Error 2 shuffle=1418848070
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:251: __sub-make] Error 2 shuffle=1418848070
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:251: __sub-make] Error 2 shuffle=1418848070
   make: Target 'prepare' not remade because of errors.


vim +47 include/asm-generic/memory_model.h

8f6aac419bd590 Christoph Lameter 2007-10-16  39  
a117e66ed45ac0 KAMEZAWA Hiroyuki 2006-03-27  40  #elif defined(CONFIG_SPARSEMEM)
a117e66ed45ac0 KAMEZAWA Hiroyuki 2006-03-27  41  /*
1a49123b343461 Zhang Yanfei      2013-10-03  42   * Note: section's mem_map is encoded to reflect its start_pfn.
a117e66ed45ac0 KAMEZAWA Hiroyuki 2006-03-27  43   * section[i].section_mem_map == mem_map's address - start_pfn;
a117e66ed45ac0 KAMEZAWA Hiroyuki 2006-03-27  44   */
67de648211fa04 Andy Whitcroft    2006-06-23  45  #define __page_to_pfn(pg)					\
aa462abe8aaf21 Ian Campbell      2011-08-17  46  ({	const struct page *__pg = (pg);				\
a117e66ed45ac0 KAMEZAWA Hiroyuki 2006-03-27 @47  	int __sec = page_to_section(__pg);			\
f05b6284ee5d3b Randy Dunlap      2007-02-10  48  	(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec)));	\
a117e66ed45ac0 KAMEZAWA Hiroyuki 2006-03-27  49  })
a117e66ed45ac0 KAMEZAWA Hiroyuki 2006-03-27  50  

:::::: The code at line 47 was first introduced by commit
:::::: a117e66ed45ac0569c039ea60bd7a9a61e031858 [PATCH] unify pfn_to_page: generic functions

:::::: TO: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
:::::: CC: Linus Torvalds <torvalds@g5.osdl.org>

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