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Date:   Mon, 21 Feb 2022 01:55:44 +0800
From:   kernel test robot <>
To:     Ard Biesheuvel <>
Subject: [ardb:arm64-ro-page-tables-pkvm-v5.17 15/28]
 include/linux/pgtable.h:84:29: error: redefinition of 'p4d_index'

tree:   git:// arm64-ro-page-tables-pkvm-v5.17
head:   1faeabde0ba3c81ad666ab924ab79ef64843d40d
commit: 8009c0d425d69c34521e0f8123ff62786f1ac8fa [15/28] mm: add default definition of p4d_index()
config: x86_64-randconfig-a001 (
compiler: clang version 15.0.0 ( d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
reproduce (this is a W=1 build):
        wget -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add ardb git://
        git fetch --no-tags ardb arm64-ro-page-tables-pkvm-v5.17
        git checkout 8009c0d425d69c34521e0f8123ff62786f1ac8fa
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 prepare

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

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/asm-offsets.c:13:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:20:
   In file included from include/linux/mm.h:33:
>> include/linux/pgtable.h:84:29: error: redefinition of 'p4d_index'
   static inline unsigned long p4d_index(unsigned long address)
   arch/x86/include/asm/pgtable.h:904:29: note: previous definition is here
   static inline unsigned long p4d_index(unsigned long address)
   1 error generated.
   make[2]: *** [scripts/ arch/x86/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1191: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:219: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

vim +/p4d_index +84 include/linux/pgtable.h

    83	#ifndef p4d_index
  > 84	static inline unsigned long p4d_index(unsigned long address)
    85	{
    86		return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
    87	}
    88	#define p4d_index p4d_index
    89	#endif

0-DAY CI Kernel Test Service, Intel Corporation

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