[davidhildenbrand:folded_pgtable 28/28] include/asm-generic/pgtable-nopmd.h:60:25: error: invalid type argument of unary '*' (have 'pud_t')

[davidhildenbrand:folded_pgtable 28/28] include/asm-generic/pgtable-nopmd.h:60:25: error: invalid type argument of unary '*' (have 'pud_t')

[kernel test robot]

tree:   https://github.com/davidhildenbrand/linux folded_pgtable
head:   710c0f29eb829f67c4c0d1c2a3f764b286282229
commit: 710c0f29eb829f67c4c0d1c2a3f764b286282229 [28/28] mm/pgtable: catch abuse of folded dummy pgd_t/p4d_t/pud_t
config: nios2-allnoconfig (https://download.01.org/0day-ci/archive/20260708/202607081246.Z9NhVAt6-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260708/202607081246.Z9NhVAt6-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/202607081246.Z9NhVAt6-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/nios2/mm/fault.c: In function 'do_page_fault':
   arch/nios2/mm/fault.c:231:39: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'p4d_k'
     231 |                 p4d_t *p4dp, *p4dp_k  p4d_k;
         |                                       ^~~~~
   arch/nios2/mm/fault.c:245:17: error: 'p4dp_k' undeclared (first use in this function); did you mean 'pmdp_k'?
     245 |                 p4dp_k = p4d_offset(pgdp_k, address);
         |                 ^~~~~~
         |                 pmdp_k
   arch/nios2/mm/fault.c:245:17: note: each undeclared identifier is reported only once for each function it appears in
   arch/nios2/mm/fault.c:246:17: error: 'p4d_k' undeclared (first use in this function); did you mean 'pmd_k'?
     246 |                 p4d_k = p4dp_get(p4dp_k);
         |                 ^~~~~
         |                 pmd_k
   arch/nios2/mm/fault.c:252:17: error: 'pud' undeclared (first use in this function); did you mean 'pudp'?
     252 |                 pud = pud_offset(p4dp, address);
         |                 ^~~
         |                 pudp
   In file included from <command-line>:
>> include/asm-generic/pgtable-nopmd.h:60:25: error: invalid type argument of unary '*' (have 'pud_t')
      60 |         pud_check_dummy(*(pudp));                                       \
         |                         ^~~~~~~
   include/linux/compiler_types.h:682:23: note: in definition of macro '__compiletime_assert'
     682 |                 if (!(condition))                                       \
         |                       ^~~~~~~~~
   include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:40:37: note: in expansion of macro 'compiletime_assert'
      40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:51:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      51 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   include/asm-generic/pgtable-nopmd.h:51:30: note: in expansion of macro 'BUILD_BUG_ON'
      51 | #define pud_check_dummy(pud) BUILD_BUG_ON(__builtin_constant_p(pud_val(pud)))
         |                              ^~~~~~~~~~~~
   include/asm-generic/pgtable-nop4d.h:67:50: note: in expansion of macro 'pgd_val'
      67 | #define p4d_val(x)                              (pgd_val((x).pgd))
         |                                                  ^~~~~~~
   include/asm-generic/pgtable-nopud.h:74:50: note: in expansion of macro 'p4d_val'
      74 | #define pud_val(x)                              (p4d_val((x).p4d))
         |                                                  ^~~~~~~
   include/asm-generic/pgtable-nopmd.h:51:64: note: in expansion of macro 'pud_val'
      51 | #define pud_check_dummy(pud) BUILD_BUG_ON(__builtin_constant_p(pud_val(pud)))
         |                                                                ^~~~~~~
   include/asm-generic/pgtable-nopmd.h:60:9: note: in expansion of macro 'pud_check_dummy'
      60 |         pud_check_dummy(*(pudp));                                       \
         |         ^~~~~~~~~~~~~~~
   arch/nios2/mm/fault.c:261:26: note: in expansion of macro 'pmd_offset'
     261 |                 pmdp_k = pmd_offset(pud_k, address);
         |                          ^~~~~~~~~~
   In file included from arch/nios2/include/asm/pgtable.h:25,
                    from include/linux/pgtable.h:6,
                    from include/linux/mm.h:31,
                    from include/linux/pid_namespace.h:7,
                    from include/linux/ptrace.h:10,
                    from arch/nios2/mm/fault.c:22:
>> arch/nios2/mm/fault.c:261:37: error: incompatible type for argument 1 of '__pmd_offset'
     261 |                 pmdp_k = pmd_offset(pud_k, address);
         |                                     ^~~~~
         |                                     |
         |                                     pud_t
   include/asm-generic/pgtable-nopmd.h:61:22: note: in definition of macro 'pmd_offset'
      61 |         __pmd_offset(pudp, address);                                    \
         |                      ^~~~
   include/asm-generic/pgtable-nopmd.h:53:51: note: expected 'pud_t *' but argument is of type 'pud_t'
      53 | static __always_inline pmd_t *__pmd_offset(pud_t *pudp, unsigned long address)
         |                                            ~~~~~~~^~~~


vim +60 include/asm-generic/pgtable-nopmd.h

    57	
    58	#define pmd_offset(pudp, address)					\
    59	({									\
  > 60		pud_check_dummy(*(pudp));					\
    61		__pmd_offset(pudp, address);					\
    62	})
    63	

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