[rppt:generic-set-memory/v0.1 5/14] include/linux/pgtable.h:2374:24: error: 'PMD_SIZE' undeclared; did you mean 'P4D_SIZE'?

Hi Mike,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git generic-set-memory/v0.1
head:   638eb4b634f16c38ed87203f47ffed3cd5b1a67c
commit: cb2eab77f64c1ad09dce2ac836357cf03966fb20 [5/14] x86/mm/pat: use a generic helper for the large page size
config: m68k-randconfig-r073-20260721 (https://download.01.org/0day-ci/archive/20260721/[email protected]/config)
compiler: m68k-linux-gcc (GCC) 16.1.0
smatch: v0.5.0-9187-g5189e3fb
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260721/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   In file included from include/linux/mm.h:31,
                    from include/linux/cpuset.h:17,
                    from kernel/sched/sched.h:33,
                    from kernel/sched/rq-offsets.c:5:
   include/linux/pgtable.h: In function 'pgtable_level_size':
>> include/linux/pgtable.h:2374:24: error: 'PMD_SIZE' undeclared (first use in this function); did you mean 'P4D_SIZE'?
    2374 |                 return PMD_SIZE;
         |                        ^~~~~~~~
         |                        P4D_SIZE
   include/linux/pgtable.h:2374:24: note: each undeclared identifier is reported only once for each function it appears in
   In file included from include/asm-generic/pgtable-nopud.h:7,
                    from arch/m68k/include/asm/pgtable_no.h:5,
                    from arch/m68k/include/asm/pgtable.h:8,
                    from include/linux/pgtable.h:6:
>> include/asm-generic/pgtable-nop4d.h:11:33: error: 'PGDIR_SHIFT' undeclared (first use in this function); did you mean 'P4D_SHIFT'?
      11 | #define P4D_SHIFT               PGDIR_SHIFT
         |                                 ^~~~~~~~~~~
   include/asm-generic/pgtable-nopud.h:18:25: note: in expansion of macro 'P4D_SHIFT'
      18 | #define PUD_SHIFT       P4D_SHIFT
         |                         ^~~~~~~~~
   include/asm-generic/pgtable-nopud.h:20:33: note: in expansion of macro 'PUD_SHIFT'
      20 | #define PUD_SIZE        (1UL << PUD_SHIFT)
         |                                 ^~~~~~~~~
   include/linux/pgtable.h:2376:24: note: in expansion of macro 'PUD_SIZE'
    2376 |                 return PUD_SIZE;
         |                        ^~~~~~~~
>> include/linux/pgtable.h:2380:24: error: 'PGDIR_SIZE' undeclared (first use in this function); did you mean 'P4D_SIZE'?
    2380 |                 return PGDIR_SIZE;
         |                        ^~~~~~~~~~
         |                        P4D_SIZE
   make[3]: *** [scripts/Makefile.build:184: kernel/sched/rq-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1405: 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 +2374 include/linux/pgtable.h

  2366	
  2367	/* Size of the memory mapped by a single leaf entry at @level */
  2368	static inline unsigned long pgtable_level_size(enum pgtable_level level)
  2369	{
  2370		switch (level) {
  2371		case PGTABLE_LEVEL_PTE:
  2372			return PAGE_SIZE;
  2373		case PGTABLE_LEVEL_PMD:
> 2374			return PMD_SIZE;
  2375		case PGTABLE_LEVEL_PUD:
  2376			return PUD_SIZE;
  2377		case PGTABLE_LEVEL_P4D:
  2378			return P4D_SIZE;
  2379		default:
> 2380			return PGDIR_SIZE;
  2381		}
  2382	}
  2383	

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