Re: [PATCH 1/2] mm/debug_vm_pgtable: Use set_pXd() to write page tables

[kernel test robot]

Hi Samuel,

kernel test robot noticed the following build errors:

[auto build test ERROR on d358e5254674b70f34c847715ca509e46eb81e6f]

url:    https://github.com/intel-lab-lkp/linux/commits/Samuel-Holland/mm-debug_vm_pgtable-Use-set_pXd-to-write-page-tables/20251211-161254
base:   d358e5254674b70f34c847715ca509e46eb81e6f
patch link:    https://lore.kernel.org/r/20251211081117.1126521-2-samuel.holland%40sifive.com
patch subject: [PATCH 1/2] mm/debug_vm_pgtable: Use set_pXd() to write page tables
config: powerpc64-randconfig-r054-20251212 (https://download.01.org/0day-ci/archive/20251212/202512120808.akRJJMa7-lkp@xxxxxxxxx/config)
compiler: powerpc64-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251212/202512120808.akRJJMa7-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512120808.akRJJMa7-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   mm/debug_vm_pgtable.c: In function 'pmd_huge_tests':
>> mm/debug_vm_pgtable.c:448:2: error: implicit declaration of function 'set_pmd'; did you mean 'set_pgd'? [-Werror=implicit-function-declaration]
     448 |  set_pmd(args->pmdp, __pmd(0));
         |  ^~~~~~~
         |  set_pgd
   mm/debug_vm_pgtable.c: In function 'pud_huge_tests':
>> mm/debug_vm_pgtable.c:468:2: error: implicit declaration of function 'set_pud'; did you mean 'set_pgd'? [-Werror=implicit-function-declaration]
     468 |  set_pud(args->pudp, __pud(0));
         |  ^~~~~~~
         |  set_pgd
   cc1: some warnings being treated as errors

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for CAN_DEV
   Depends on [n]: NETDEVICES [=n] && CAN [=y]
   Selected by [y]:
   - CAN [=y] && NET [=y]


vim +448 mm/debug_vm_pgtable.c

   433	
   434	#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
   435	static void __init pmd_huge_tests(struct pgtable_debug_args *args)
   436	{
   437		pmd_t pmd;
   438	
   439		if (!arch_vmap_pmd_supported(args->page_prot) ||
   440		    args->fixed_alignment < PMD_SIZE)
   441			return;
   442	
   443		pr_debug("Validating PMD huge\n");
   444		/*
   445		 * X86 defined pmd_set_huge() verifies that the given
   446		 * PMD is not a populated non-leaf entry.
   447		 */
 > 448		set_pmd(args->pmdp, __pmd(0));
   449		WARN_ON(!pmd_set_huge(args->pmdp, __pfn_to_phys(args->fixed_pmd_pfn), args->page_prot));
   450		WARN_ON(!pmd_clear_huge(args->pmdp));
   451		pmd = pmdp_get(args->pmdp);
   452		WARN_ON(!pmd_none(pmd));
   453	}
   454	
   455	static void __init pud_huge_tests(struct pgtable_debug_args *args)
   456	{
   457		pud_t pud;
   458	
   459		if (!arch_vmap_pud_supported(args->page_prot) ||
   460		    args->fixed_alignment < PUD_SIZE)
   461			return;
   462	
   463		pr_debug("Validating PUD huge\n");
   464		/*
   465		 * X86 defined pud_set_huge() verifies that the given
   466		 * PUD is not a populated non-leaf entry.
   467		 */
 > 468		set_pud(args->pudp, __pud(0));
   469		WARN_ON(!pud_set_huge(args->pudp, __pfn_to_phys(args->fixed_pud_pfn), args->page_prot));
   470		WARN_ON(!pud_clear_huge(args->pudp));
   471		pud = pudp_get(args->pudp);
   472		WARN_ON(!pud_none(pud));
   473	}
   474	#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
   475	static void __init pmd_huge_tests(struct pgtable_debug_args *args) { }
   476	static void __init pud_huge_tests(struct pgtable_debug_args *args) { }
   477	#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
   478	

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