linux-kernel - [rppt:gfp-unmapped/v0 1/3] mm/page_alloc.c:90:9: warning: 'PMD

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Date:   Fri, 21 Jan 2022 11:20:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Mike Rapoport <rppt@...nel.org>, linux-kernel@...r.kernel.org
Subject: [rppt:gfp-unmapped/v0 1/3] mm/page_alloc.c:90:9: warning:
 'PMD_ORDER' macro redefined

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git gfp-unmapped/v0
head:   53acd000a0eef1457aaa4930c0d2003d7785f799
commit: 253f456a5cb652a16a59cc4ac2e18669997d79cd [1/3] mm/page_alloc: introduce __GFP_UNMAPPED and MIGRETE_UNMAPPED
config: mips-loongson1c_defconfig (https://download.01.org/0day-ci/archive/20220121/202201211125.en8nqmwl-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f7b7138a62648f4019c55e4671682af1f851f295)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/commit/?id=253f456a5cb652a16a59cc4ac2e18669997d79cd
        git remote add rppt https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git
        git fetch --no-tags rppt gfp-unmapped/v0
        git checkout 253f456a5cb652a16a59cc4ac2e18669997d79cd
        # 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=mips SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> mm/page_alloc.c:90:9: warning: 'PMD_ORDER' macro redefined [-Wmacro-redefined]
   #define PMD_ORDER      (PMD_SHIFT - PAGE_SHIFT)
           ^
   arch/mips/include/asm/pgtable-32.h:85:9: note: previous definition is here
   #define PMD_ORDER       aieeee_attempt_to_allocate_pmd
           ^
   mm/page_alloc.c:3955:15: warning: no previous prototype for function 'should_fail_alloc_page' [-Wmissing-prototypes]
   noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
                 ^
   mm/page_alloc.c:3955:10: note: declare 'static' if the function is not intended to be used outside of this translation unit
   noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
            ^
            static 
   2 warnings generated.
--
>> mm/page_alloc.c:90:9: warning: 'PMD_ORDER' macro redefined [-Wmacro-redefined]
   #define PMD_ORDER      (PMD_SHIFT - PAGE_SHIFT)
           ^
   arch/mips/include/asm/pgtable-32.h:85:9: note: previous definition is here
   #define PMD_ORDER       aieeee_attempt_to_allocate_pmd
           ^
   1 warning generated.


vim +/PMD_ORDER +90 mm/page_alloc.c

    85	
    86	/*
    87	 * FIXME: add a proper definition in include/linux/mm.h once DAX and arch
    88	 * people agree on the name
    89	 */
  > 90	#define PMD_ORDER      (PMD_SHIFT - PAGE_SHIFT)
    91	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org