Hi Nicholas,

I love your patch! Yet something to improve:

[auto build test ERROR on hnaz-linux-mm/master]
[also build test ERROR on arm64/for-next/core powerpc/next tip/x86/mm linus/master v5.8 next-20200807]
[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/20200810-103105
base:   https://github.com/hnaz/linux-mm master
config: i386-randconfig-s002-20200810 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-118-ge1578773-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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

All errors (new ones prefixed by >>):

>> arch/x86/mm/ioremap.c:484:6: error: redefinition of 'arch_vmap_p4d_supported'
     484 | bool arch_vmap_p4d_supported(pgprot_t prot)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/io.h:911,
                    from arch/x86/include/asm/io.h:375,
                    from arch/x86/include/asm/dma.h:13,
                    from include/linux/memblock.h:14,
                    from arch/x86/mm/ioremap.c:10:
   include/linux/vmalloc.h:92:20: note: previous definition of 'arch_vmap_p4d_supported' was here
      92 | static inline bool arch_vmap_p4d_supported(pgprot_t prot) { return false; }
         |                    ^~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/mm/ioremap.c:489:6: error: redefinition of 'arch_vmap_pud_supported'
     489 | bool arch_vmap_pud_supported(pgprot_t prot)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/io.h:911,
                    from arch/x86/include/asm/io.h:375,
                    from arch/x86/include/asm/dma.h:13,
                    from include/linux/memblock.h:14,
                    from arch/x86/mm/ioremap.c:10:
   include/linux/vmalloc.h:93:20: note: previous definition of 'arch_vmap_pud_supported' was here
      93 | static inline bool arch_vmap_pud_supported(pgprot_t prot) { return false; }
         |                    ^~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/mm/ioremap.c:498:6: error: redefinition of 'arch_vmap_pmd_supported'
     498 | bool arch_vmap_pmd_supported(pgprot_t prot)
         |      ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/io.h:911,
                    from arch/x86/include/asm/io.h:375,
                    from arch/x86/include/asm/dma.h:13,
                    from include/linux/memblock.h:14,
                    from arch/x86/mm/ioremap.c:10:
   include/linux/vmalloc.h:94:20: note: previous definition of 'arch_vmap_pmd_supported' was here
      94 | static inline bool arch_vmap_pmd_supported(pgprot_t prot) { return false; }
         |                    ^~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/mm/ioremap.c:737:17: warning: no previous prototype for 'early_memremap_pgprot_adjust' [-Wmissing-prototypes]
     737 | pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/arch_vmap_p4d_supported +484 arch/x86/mm/ioremap.c

   483	
 > 484	bool arch_vmap_p4d_supported(pgprot_t prot)
   485	{
   486		return false;
   487	}
   488	
 > 489	bool arch_vmap_pud_supported(pgprot_t prot)
   490	{
   491	#ifdef CONFIG_X86_64
   492		return boot_cpu_has(X86_FEATURE_GBPAGES);
   493	#else
   494		return false;
   495	#endif
   496	}
   497	
 > 498	bool arch_vmap_pmd_supported(pgprot_t prot)
   499	{
   500		return boot_cpu_has(X86_FEATURE_PSE);
   501	}
   502	

---
0-DAY CI Kernel Test Service, Intel Corporation
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