linux-kernel - fs/proc/vmcore.c:443:42: warning: unused variable 'vmcore_mmap

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Message-ID: <202204290642.I2dLZBgO-lkp@intel.com>
Date:   Fri, 29 Apr 2022 06:33:32 +0800
From:   kernel test robot <lkp@...el.com>
To:     Nick Kossifidis <mick@....forth.gr>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: fs/proc/vmcore.c:443:42: warning: unused variable 'vmcore_mmap_ops'

Hi Nick,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   249aca0d3d631660aa3583c6a3559b75b6e971b4
commit: 5640975003d0234da08559677e22ec25b9cb3267 RISC-V: Add crash kernel support
date:   1 year ago
config: riscv-randconfig-c006-20220428 (https://download.01.org/0day-ci/archive/20220429/202204290642.I2dLZBgO-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c59473aacce38cd7dd77eebceaf3c98c5707ab3b)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5640975003d0234da08559677e22ec25b9cb3267
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 5640975003d0234da08559677e22ec25b9cb3267
        # save the config file
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 

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 >>):

>> fs/proc/vmcore.c:443:42: warning: unused variable 'vmcore_mmap_ops' [-Wunused-const-variable]
   static const struct vm_operations_struct vmcore_mmap_ops = {
                                            ^
   8 warnings generated.


vim +/vmcore_mmap_ops +443 fs/proc/vmcore.c

9cb218131de1c59 Michael Holzheu 2013-09-11  442  
9cb218131de1c59 Michael Holzheu 2013-09-11 @443  static const struct vm_operations_struct vmcore_mmap_ops = {
9cb218131de1c59 Michael Holzheu 2013-09-11  444  	.fault = mmap_vmcore_fault,
9cb218131de1c59 Michael Holzheu 2013-09-11  445  };
9cb218131de1c59 Michael Holzheu 2013-09-11  446  

:::::: The code at line 443 was first introduced by commit
:::::: 9cb218131de1c59dca9063b2efe876f053f316af vmcore: introduce remap_oldmem_pfn_range()

:::::: TO: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp