[akpm-mm:mm-new 117/130] include/asm-generic/fixmap.h:77:2: error: call to undeclared function '__set_fixmap'; ISO C99 and later do not support implicit function declarations

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
head:   0587fb0c820d86e5b77a975680d79b5176d09abb
commit: 93580c23bb3da5dd2926d6ae991ef04c2cdacaf2 [117/130] include/asm-generic/fixmap.h: reimplement nasty macros in C
config: mips-xway_defconfig (https://download.01.org/0day-ci/archive/20260430/202604300638.A3yVzhM3-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260430/202604300638.A3yVzhM3-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/202604300638.A3yVzhM3-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/mips/kernel/asm-offsets.c:17:
   In file included from include/linux/mm.h:31:
   In file included from include/linux/pgtable.h:6:
   In file included from arch/mips/include/asm/pgtable.h:14:
   In file included from arch/mips/include/asm/pgtable-32.h:17:
   In file included from arch/mips/include/asm/fixmap.h:70:
>> include/asm-generic/fixmap.h:77:2: error: call to undeclared function '__set_fixmap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      77 |         __set_fixmap(idx, phys, flags);
         |         ^
>> include/asm-generic/fixmap.h:84:40: error: use of undeclared identifier 'PAGE_KERNEL'
      84 |         return __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL);
         |                                               ^~~~~~~~~~~~~~~~~~
   include/asm-generic/fixmap.h:48:28: note: expanded from macro 'FIXMAP_PAGE_NORMAL'
      48 | #define FIXMAP_PAGE_NORMAL PAGE_KERNEL
         |                            ^~~~~~~~~~~
   include/asm-generic/fixmap.h:93:2: error: call to undeclared function '__set_fixmap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      93 |         __set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE);
         |         ^
   include/asm-generic/fixmap.h:93:26: error: use of undeclared identifier 'PAGE_KERNEL_NOCACHE'
      93 |         __set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE);
         |                                 ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/fixmap.h:54:29: note: expanded from macro 'FIXMAP_PAGE_NOCACHE'
      54 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
         |                             ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/fixmap.h:99:33: error: use of undeclared identifier 'PAGE_KERNEL_NOCACHE'
      99 |         __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE);
         |                                        ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/fixmap.h:54:29: note: expanded from macro 'FIXMAP_PAGE_NOCACHE'
      54 | #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
         |                             ^~~~~~~~~~~~~~~~~~~
   In file included from arch/mips/kernel/asm-offsets.c:26:
   In file included from include/linux/kvm_host.h:5:
   In file included from include/linux/entry-virt.h:7:
   In file included from include/linux/syscalls.h:95:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:6:
   In file included from include/linux/ring_buffer.h:7:
   include/linux/poll.h:134:27: warning: division by zero is undefined [-Wdivision-by-zero]
     134 |                 M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
         |                                         ^~~~~~~~~
   include/linux/poll.h:132:32: note: expanded from macro 'M'
     132 | #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
         |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/poll.h:118:51: note: expanded from macro '__MAP'
     118 |         (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
         |                                                          ^ ~~~~~~~~~
   include/linux/poll.h:134:39: warning: division by zero is undefined [-Wdivision-by-zero]
     134 |                 M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) |
         |                                                     ^~~~~~~~~
   include/linux/poll.h:132:32: note: expanded from macro 'M'
     132 | #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X)
         |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/poll.h:118:51: note: expanded from macro '__MAP'
     118 |         (from < to ? (v & from) * (to/from) : (v & from) / (from/to))
         |                                                          ^ ~~~~~~~~~
   2 warnings and 5 errors generated.
   make[3]: *** [scripts/Makefile.build:184: arch/mips/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1371: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/__set_fixmap +77 include/asm-generic/fixmap.h

    72	
    73	/* Return a pointer with offset calculated */
    74	static inline unsigned long
    75	__set_fixmap_offset(enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
    76	{
  > 77		__set_fixmap(idx, phys, flags);
    78		return fix_to_virt(idx) + (phys & (PAGE_SIZE - 1));
    79	}
    80	
    81	static inline unsigned long
    82	set_fixmap_offset(enum fixed_addresses idx, phys_addr_t phys)
    83	{
  > 84		return __set_fixmap_offset(idx, phys, FIXMAP_PAGE_NORMAL);
    85	}
    86	

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