linux-kernel - Re: [PATCH] damon: Use pmdp_get instead of drect dereferencing pmd.

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Date:   Fri, 28 Jul 2023 16:08:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     Levi Yun <ppbuk5246@...il.com>, sj@...nel.org,
        akpm@...ux-foundation.org
Cc:     oe-kbuild-all@...ts.linux.dev, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Levi Yun <ppbuk5246@...il.com>
Subject: Re: [PATCH] damon: Use pmdp_get instead of drect dereferencing pmd.

Hi Levi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.5-rc3 next-20230728]
[cannot apply to sj/damon/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Levi-Yun/damon-Use-pmdp_get-instead-of-drect-dereferencing-pmd/20230728-024044
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230727183745.682880-1-ppbuk5246%40gmail.com
patch subject: [PATCH] damon: Use pmdp_get instead of drect dereferencing pmd.
config: i386-randconfig-i016-20230727 (https://download.01.org/0day-ci/archive/20230728/202307281532.pVsrTsL2-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230728/202307281532.pVsrTsL2-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307281532.pVsrTsL2-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/damon/vaddr.c: In function 'damon_young_pmd_entry':
>> mm/damon/vaddr.c:440:15: warning: unused variable 'pmde' [-Wunused-variable]
     440 |         pmd_t pmde;
         |               ^~~~

vim +/pmde +440 mm/damon/vaddr.c

   434	
   435	static int damon_young_pmd_entry(pmd_t *pmd, unsigned long addr,
   436			unsigned long next, struct mm_walk *walk)
   437	{
   438		pte_t *pte;
   439		pte_t ptent;
 > 440		pmd_t pmde;
   441		spinlock_t *ptl;
   442		struct folio *folio;
   443		struct damon_young_walk_private *priv = walk->private;
   444	

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