[davidhildenbrand:rmap_batching 3/11] include/linux/pgtable.h:638:20: warning: conflicting types for 'ptep_set_wrprotect'; have 'void(struct mm_struct *, long unsigned int, pte_t *)' {aka 'void(struct mm_struct *, long unsigned int, long long unsigned int *)'}

[davidhildenbrand:rmap_batching 3/11] include/linux/pgtable.h:638:20: warning: conflicting types for 'ptep_set_wrprotect'; have 'void(struct mm_struct *, long unsigned int, pte_t *)' {aka 'void(struct mm_struct *, long unsigned int, long long unsigned int *)'}

[kernel test robot]

tree:   https://github.com/davidhildenbrand/linux rmap_batching
head:   c54f3b69b7a799efa06dbf58a60db9b3fac04111
commit: d84c9158468598cb15b038bca27fd80e113b456c [3/11] mm/memory: optimize fork() with PTE-mapped THP
config: arm-randconfig-r062-20240120 (https://download.01.org/0day-ci/archive/20240120/202401201235.fcCAbfbN-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240120/202401201235.fcCAbfbN-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/202401201235.fcCAbfbN-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/arm/include/asm/page.h:169,
                    from arch/arm/include/asm/thread_info.h:14,
                    from include/linux/thread_info.h:60,
                    from include/linux/sched.h:14,
                    from arch/arm/kernel/asm-offsets.c:11:
   include/linux/pgtable.h: In function 'pte_next_pfn':
   include/linux/pgtable.h:218:45: error: 'PFN_PTE_SHIFT' undeclared (first use in this function); did you mean 'PAGE_SHIFT'?
     218 |         return __pte(pte_val(pte) + (1UL << PFN_PTE_SHIFT));
         |                                             ^~~~~~~~~~~~~
   arch/arm/include/asm/pgtable-3level-types.h:51:26: note: in definition of macro '__pte'
      51 | #define __pte(x)        (x)
         |                          ^
   include/linux/pgtable.h:218:45: note: each undeclared identifier is reported only once for each function it appears in
     218 |         return __pte(pte_val(pte) + (1UL << PFN_PTE_SHIFT));
         |                                             ^~~~~~~~~~~~~
   arch/arm/include/asm/pgtable-3level-types.h:51:26: note: in definition of macro '__pte'
      51 | #define __pte(x)        (x)
         |                          ^
   In file included from include/linux/mm.h:29,
                    from arch/arm/kernel/asm-offsets.c:12:
   include/linux/pgtable.h: In function 'wrprotect_ptes':
   include/linux/pgtable.h:227:17: error: implicit declaration of function 'ptep_set_wrprotect'; did you mean 'pte_wrprotect'? [-Werror=implicit-function-declaration]
     227 |                 ptep_set_wrprotect(mm, addr, ptep);
         |                 ^~~~~~~~~~~~~~~~~~
         |                 pte_wrprotect
   include/linux/pgtable.h: At top level:
>> include/linux/pgtable.h:638:20: warning: conflicting types for 'ptep_set_wrprotect'; have 'void(struct mm_struct *, long unsigned int,  pte_t *)' {aka 'void(struct mm_struct *, long unsigned int,  long long unsigned int *)'}
     638 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
         |                    ^~~~~~~~~~~~~~~~~~
   include/linux/pgtable.h:638:20: error: static declaration of 'ptep_set_wrprotect' follows non-static declaration
   include/linux/pgtable.h:227:17: note: previous implicit declaration of 'ptep_set_wrprotect' with type 'void(struct mm_struct *, long unsigned int,  pte_t *)' {aka 'void(struct mm_struct *, long unsigned int,  long long unsigned int *)'}
     227 |                 ptep_set_wrprotect(mm, addr, ptep);
         |                 ^~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[3]: *** [scripts/Makefile.build:116: arch/arm/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1191: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:234: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:234: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +638 include/linux/pgtable.h

2f0584f3f4bd60 include/linux/pgtable.h       Rick Edgecombe 2023-06-12  635  
^1da177e4c3f41 include/asm-generic/pgtable.h Linus Torvalds 2005-04-16  636  #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
8c65b4a6045059 include/asm-generic/pgtable.h Tim Schmielau  2005-11-07  637  struct mm_struct;
^1da177e4c3f41 include/asm-generic/pgtable.h Linus Torvalds 2005-04-16 @638  static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
^1da177e4c3f41 include/asm-generic/pgtable.h Linus Torvalds 2005-04-16  639  {
c33c794828f212 include/linux/pgtable.h       Ryan Roberts   2023-06-12  640  	pte_t old_pte = ptep_get(ptep);
^1da177e4c3f41 include/asm-generic/pgtable.h Linus Torvalds 2005-04-16  641  	set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
^1da177e4c3f41 include/asm-generic/pgtable.h Linus Torvalds 2005-04-16  642  }
^1da177e4c3f41 include/asm-generic/pgtable.h Linus Torvalds 2005-04-16  643  #endif
^1da177e4c3f41 include/asm-generic/pgtable.h Linus Torvalds 2005-04-16  644  

:::::: The code at line 638 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

-- 
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https://github.com/intel/lkp-tests/wiki