Hi Nicholas,

I love your patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on arm64/for-next/core v5.11-rc5 next-20210125]
[cannot apply to hnaz-linux-mm/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    
https://github.com/0day-ci/linux/commits/Nicholas-Piggin/huge-vmalloc-mappings/20210126-143141
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # 
https://github.com/0day-ci/linux/commit/e43d3c665212ea34b790ab8d150bbde9d42e35b8
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review 
Nicholas-Piggin/huge-vmalloc-mappings/20210126-143141
        git checkout e43d3c665212ea34b790ab8d150bbde9d42e35b8
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>

All errors (new ones prefixed by >>):

   mm/debug_vm_pgtable.c: In function 'pmd_huge_tests':
   mm/debug_vm_pgtable.c:221:7: error: implicit declaration of function 
'arch_ioremap_pmd_supported'; did you mean 'arch_vmap_pmd_supported'? 
[-Werror=implicit-function-declaration]
     221 |  if (!arch_ioremap_pmd_supported())
         |       ^~~~~~~~~~~~~~~~~~~~~~~~~~
         |       arch_vmap_pmd_supported
   mm/debug_vm_pgtable.c: In function 'pud_huge_tests':
>> mm/debug_vm_pgtable.c:343:7: error: implicit declaration of function 
>> 'arch_ioremap_pud_supported'; did you mean 'arch_vmap_pud_supported'? 
>> [-Werror=implicit-function-declaration]
     343 |  if (!arch_ioremap_pud_supported())
         |       ^~~~~~~~~~~~~~~~~~~~~~~~~~
         |       arch_vmap_pud_supported
   cc1: some warnings being treated as errors


vim +343 mm/debug_vm_pgtable.c

a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  337  
85a144632dcc71 Aneesh Kumar K.V  2020-10-15  338  #ifdef 
CONFIG_HAVE_ARCH_HUGE_VMAP
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  339  static void __init 
pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  340  {
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  341        pud_t pud;
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  342  
85a144632dcc71 Aneesh Kumar K.V  2020-10-15 @343        if 
(!arch_ioremap_pud_supported())
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  344                return;
6315df41afccf1 Anshuman Khandual 2020-08-06  345  
6315df41afccf1 Anshuman Khandual 2020-08-06  346        pr_debug("Validating 
PUD huge\n");
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  347        /*
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  348         * X86 defined 
pud_set_huge() verifies that the given
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  349         * PUD is not a 
populated non-leaf entry.
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  350         */
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  351        WRITE_ONCE(*pudp, 
__pud(0));
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  352        
WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot));
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  353        
WARN_ON(!pud_clear_huge(pudp));
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  354        pud = READ_ONCE(*pudp);
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  355        WARN_ON(!pud_none(pud));
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  356  }
85a144632dcc71 Aneesh Kumar K.V  2020-10-15  357  #else /* 
!CONFIG_HAVE_ARCH_HUGE_VMAP */
85a144632dcc71 Aneesh Kumar K.V  2020-10-15  358  static void __init 
pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { }
85a144632dcc71 Aneesh Kumar K.V  2020-10-15  359  #endif /* 
!CONFIG_HAVE_ARCH_HUGE_VMAP */
85a144632dcc71 Aneesh Kumar K.V  2020-10-15  360  

---
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