[davidhildenbrand:vm_normal_page_pud 6/9] mm/memory.c:525:6: error: array type 'pgd_t' (aka 'unsigned int[2]') is not assignable

[davidhildenbrand:vm_normal_page_pud 6/9] mm/memory.c:525:6: error: array type 'pgd_t' (aka 'unsigned int[2]') is not assignable

[kernel test robot]

tree:   https://github.com/davidhildenbrand/linux vm_normal_page_pud
head:   45efeb8305fe9bbe4e6cfbd2adcf5810254f5828
commit: a9309234598507efc5d14aadf44296d5f9e40ecb [6/9] mm/memory: convert print_bad_pte() to print_bad_page_map()
config: arm-bcm2835_defconfig (https://download.01.org/0day-ci/archive/20250716/202507160956.vS2CVmpM-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 16534d19bf50bde879a83f0ae62875e2c5120e64)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250716/202507160956.vS2CVmpM-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/202507160956.vS2CVmpM-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/memory.c:525:6: error: array type 'pgd_t' (aka 'unsigned int[2]') is not assignable
     525 |         pgd = pgdp_get(pgdp);
         |         ~~~ ^
   1 error generated.


vim +525 mm/memory.c

   508	
   509	static void __dump_bad_page_map_pgtable(struct mm_struct *mm, unsigned long addr)
   510	{
   511		unsigned long long pgdv, p4dv, pudv, pmdv;
   512		pgd_t pgd, *pgdp;
   513		p4d_t p4d, *p4dp;
   514		pud_t pud, *pudp;
   515		pmd_t *pmdp;
   516	
   517		/*
   518		 * This looks like a fully lockless walk, however, the caller is
   519		 * expected to hold the leaf page table lock in addition to other
   520		 * rmap/mm/vma locks. So this is just a re-walk to dump page table
   521		 * content while any concurrent modifications should be completely
   522		 * prevented.
   523		 */
   524		pgdp = pgd_offset(mm, addr);
 > 525		pgd = pgdp_get(pgdp);
   526		pgdv = pgd_val(pgd);
   527	
   528		if (!pgd_present(pgd) || pgd_leaf(pgd)) {
   529			pr_alert("pgd:%08llx\n", pgdv);
   530			return;
   531		}
   532	
   533		p4dp = p4d_offset(pgdp, addr);
   534		p4d = p4dp_get(p4dp);
   535		p4dv = p4d_val(p4d);
   536	
   537		if (!p4d_present(p4d) || p4d_leaf(p4d)) {
   538			pr_alert("pgd:%08llx p4d:%08llx\n", pgdv, p4dv);
   539			return;
   540		}
   541	
   542		pudp = pud_offset(p4dp, addr);
   543		pud = pudp_get(pudp);
   544		pudv = pud_val(pud);
   545	
   546		if (!pud_present(pud) || pud_leaf(pud)) {
   547			pr_alert("pgd:%08llx p4d:%08llx pud:%08llx\n", pgdv, p4dv, pudv);
   548			return;
   549		}
   550	
   551		pmdp = pmd_offset(pudp, addr);
   552		pmdv = pmd_val(pmdp_get(pmdp));
   553	
   554		/*
   555		 * Dumping the PTE would be nice, but it's tricky with CONFIG_HIGHPTE,
   556		 * because the table should already be mapped by the caller and
   557		 * doing another map would be bad. print_bad_page_map() should
   558		 * already take care of printing the PTE.
   559		 */
   560		pr_alert("pgd:%08llx p4d:%08llx pud:%08llx pmd:%08llx\n", pgdv,
   561			 p4dv, pudv, pmdv);
   562	}
   563	

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