[linux-next:master 6089/6355] include/linux/highmem-internal.h:86:39: error: passing 'const struct folio *' to parameter of type 'struct folio *' discards qualifiers

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   4ac65880ebca1b68495bd8704263b26c050ac010
commit: 598ad57d4b4687c7cbb9fc8af954143d250b03ae [6089/6355] mm: constify highmem related functions for improved const-correctness
config: i386-buildonly-randconfig-002-20250905 (https://download.01.org/0day-ci/archive/20250905/202509051023.d6AUXYH1-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250905/202509051023.d6AUXYH1-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/202509051023.d6AUXYH1-lkp@intel.com/

Note: the linux-next/master HEAD 4ac65880ebca1b68495bd8704263b26c050ac010 builds fine.
      It may have been fixed somewhere.

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/asm-offsets.c:14:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:23:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:14:
>> include/linux/highmem-internal.h:86:39: error: passing 'const struct folio *' to parameter of type 'struct folio *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
      86 |         const struct page *page = folio_page(folio, offset / PAGE_SIZE);
         |                                              ^~~~~
   include/linux/page-flags.h:319:53: note: passing argument to parameter 'folio' here
     319 | static inline struct page *folio_page(struct folio *folio, unsigned long n)
         |                                                     ^
   1 error generated.
   make[3]: *** [scripts/Makefile.build:182: arch/x86/kernel/asm-offsets.s] Error 1 shuffle=2013769869
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1282: prepare0] Error 2 shuffle=2013769869
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2 shuffle=2013769869
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2 shuffle=2013769869
   make: Target 'prepare' not remade because of errors.


vim +86 include/linux/highmem-internal.h

    83	
    84	static inline void *kmap_local_folio(const struct folio *folio, size_t offset)
    85	{
  > 86		const struct page *page = folio_page(folio, offset / PAGE_SIZE);
    87		return __kmap_local_page_prot(page, kmap_prot) + offset % PAGE_SIZE;
    88	}
    89	

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