linux-kernel - arch/arm64/include/asm/pgtable-hwdef.h:82:64: warning: "PMD

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Date:   Sat, 20 May 2023 19:29:27 +0800
From:   kernel test robot <lkp@...el.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: arch/arm64/include/asm/pgtable-hwdef.h:82:64: warning: "PMD_SHIFT"
 is not defined, evaluates to 0

Hi Masahiro,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d635f6cc934bcd467c5d67148ece74632fd96abf
commit: 80b6093b55e31c2c40ff082fb32523d4e852954f kbuild: add -Wundef to KBUILD_CPPFLAGS for W=1 builds
date:   5 months ago
config: arm64-randconfig-r005-20230520
compiler: aarch64-linux-gcc (GCC) 12.1.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=80b6093b55e31c2c40ff082fb32523d4e852954f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 80b6093b55e31c2c40ff082fb32523d4e852954f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305201926.3oEwKwvf-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/arm64/include/asm/assembler.h:25,
                    from arch/arm64/include/asm/linkage.h:5,
                    from include/linux/linkage.h:8,
                    from arch/arm64/kernel/entry.S:12:
>> arch/arm64/include/asm/pgtable-hwdef.h:82:64: warning: "PMD_SHIFT" is not defined, evaluates to 0 [-Wundef]
      82 | #define CONT_PMD_SHIFT          (CONFIG_ARM64_CONT_PMD_SHIFT + PMD_SHIFT)
         |                                                                ^~~~~~~~~
   arch/arm64/include/asm/kernel-pgtable.h:133:41: note: in expansion of macro 'CONT_PMD_SHIFT'
     133 | #define ARM64_MEMSTART_SHIFT            CONT_PMD_SHIFT
         |                                         ^~~~~~~~~~~~~~
   arch/arm64/include/asm/kernel-pgtable.h:144:5: note: in expansion of macro 'ARM64_MEMSTART_SHIFT'
     144 | #if ARM64_MEMSTART_SHIFT < SECTION_SIZE_BITS
         |     ^~~~~~~~~~~~~~~~~~~~


vim +/PMD_SHIFT +82 arch/arm64/include/asm/pgtable-hwdef.h

e676594115f0bc Gavin Shan    2020-09-10  81  
e676594115f0bc Gavin Shan    2020-09-10 @82  #define CONT_PMD_SHIFT		(CONFIG_ARM64_CONT_PMD_SHIFT + PMD_SHIFT)
a1634a542f7430 Gavin Shan    2020-06-30  83  #define CONT_PMDS		(1 << (CONT_PMD_SHIFT - PMD_SHIFT))
66b3923a1a0f77 David Woods   2015-12-17  84  #define CONT_PMD_SIZE		(CONT_PMDS * PMD_SIZE)
66b3923a1a0f77 David Woods   2015-12-17  85  #define CONT_PMD_MASK		(~(CONT_PMD_SIZE - 1))
ecf35a237a85d7 Jeremy Linton 2015-10-07  86  

:::::: The code at line 82 was first introduced by commit
:::::: e676594115f0bcc12d4791f9ee919e20d8d750ee arm64/mm: Unify CONT_PMD_SHIFT

:::::: TO: Gavin Shan <gshan@...hat.com>
:::::: CC: Will Deacon <will@...nel.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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