Re: [PATCH 1/5] mm: Introduce a common definition of mk_pte()

[kernel test robot <lkp@intel.com>]

Hi Matthew,

kernel test robot noticed the following build errors:

[auto build test ERROR on geert-m68k/for-next]
[also build test ERROR on geert-m68k/for-linus uml/next linus/master v6.11-rc3 next-20240814]
[cannot apply to uml/fixes]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Matthew-Wilcox-Oracle/mm-Introduce-a-common-definition-of-mk_pte/20240815-001852
base:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git for-next
patch link:    https://lore.kernel.org/r/20240814154427.162475-2-willy%40infradead.org
patch subject: [PATCH 1/5] mm: Introduce a common definition of mk_pte()
config: alpha-randconfig-r051-20240815 (https://download.01.org/0day-ci/archive/20240815/202408151008.zU4OfDoL-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240815/202408151008.zU4OfDoL-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/202408151008.zU4OfDoL-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/alpha/include/asm/page.h:89,
                    from include/linux/shm.h:6,
                    from include/linux/sched.h:23,
                    from arch/alpha/kernel/asm-offsets.c:10:
   include/linux/pgtable.h: In function 'mk_pte':
>> 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/pgtable.h:47:24: note: in expansion of macro 'page_to_pfn'
      47 |         return pfn_pte(page_to_pfn(page), pgprot);
         |                        ^~~~~~~~~~~
   In file included from include/linux/pid_namespace.h:7,
                    from include/linux/ptrace.h:10,
                    from arch/alpha/kernel/asm-offsets.c:11:
   include/linux/mm.h: At top level:
>> include/linux/mm.h:1904:29: error: conflicting types for 'page_to_section'; have 'long unsigned int(const struct page *)'
    1904 | 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/pgtable.h:47:24: note: in expansion of macro 'page_to_pfn'
      47 |         return pfn_pte(page_to_pfn(page), pgprot);
         |                        ^~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[3]: *** [scripts/Makefile.build:117: arch/alpha/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1208: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:240: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:240: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


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

8f6aac419bd590f Christoph Lameter 2007-10-16  39  
a117e66ed45ac05 KAMEZAWA Hiroyuki 2006-03-27  40  #elif defined(CONFIG_SPARSEMEM)
a117e66ed45ac05 KAMEZAWA Hiroyuki 2006-03-27  41  /*
1a49123b3434615 Zhang Yanfei      2013-10-03  42   * Note: section's mem_map is encoded to reflect its start_pfn.
a117e66ed45ac05 KAMEZAWA Hiroyuki 2006-03-27  43   * section[i].section_mem_map == mem_map's address - start_pfn;
a117e66ed45ac05 KAMEZAWA Hiroyuki 2006-03-27  44   */
67de648211fa041 Andy Whitcroft    2006-06-23  45  #define __page_to_pfn(pg)					\
aa462abe8aaf219 Ian Campbell      2011-08-17  46  ({	const struct page *__pg = (pg);				\
a117e66ed45ac05 KAMEZAWA Hiroyuki 2006-03-27 @47  	int __sec = page_to_section(__pg);			\
f05b6284ee5d3be Randy Dunlap      2007-02-10  48  	(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec)));	\
a117e66ed45ac05 KAMEZAWA Hiroyuki 2006-03-27  49  })
a117e66ed45ac05 KAMEZAWA Hiroyuki 2006-03-27  50  

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