linux-kernel - fs/proc/task_mmu.c:743:33: warning: 'smaps_shmem_walk

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Message-ID: <202304031749.UiyJpxzF-lkp@intel.com>
Date:   Mon, 3 Apr 2023 17:23:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Jason Gunthorpe <jgg@...pe.ca>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Steven Price <steven.price@....com>
Subject: fs/proc/task_mmu.c:743:33: warning: 'smaps_shmem_walk_ops' defined
 but not used

Hi Christoph,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7e364e56293bb98cae1b55fd835f5991c4e96e7d
commit: 7b86ac3371b70c3fd8fd95501719beb1faab719f pagewalk: separate function pointers from iterator data
date:   3 years, 7 months ago
config: i386-buildonly-randconfig-r004-20230403 (https://download.01.org/0day-ci/archive/20230403/202304031749.UiyJpxzF-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7b86ac3371b70c3fd8fd95501719beb1faab719f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7b86ac3371b70c3fd8fd95501719beb1faab719f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/proc/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304031749.UiyJpxzF-lkp@intel.com/

All warnings (new ones prefixed by >>):

   fs/proc/task_mmu.c: In function 'pagemap_pmd_range':
   fs/proc/task_mmu.c:1367:22: warning: variable 'orig_pte' set but not used [-Wunused-but-set-variable]
    1367 |         pte_t *pte, *orig_pte;
         |                      ^~~~~~~~
   At top level:
>> fs/proc/task_mmu.c:743:33: warning: 'smaps_shmem_walk_ops' defined but not used [-Wunused-const-variable=]
     743 | static const struct mm_walk_ops smaps_shmem_walk_ops = {
         |                                 ^~~~~~~~~~~~~~~~~~~~


vim +/smaps_shmem_walk_ops +743 fs/proc/task_mmu.c

   742	
 > 743	static const struct mm_walk_ops smaps_shmem_walk_ops = {
   744		.pmd_entry		= smaps_pte_range,
   745		.hugetlb_entry		= smaps_hugetlb_range,
   746		.pte_hole		= smaps_pte_hole,
   747	};
   748	

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