[anolis-intel-cloud:devel-5.10 9/9] mm/memory.c:5965:15: warning: unused variable 'pmd'

[kernel test robot <lkp@intel.com>]

Hi Xu,

FYI, the error/warning still remains.

tree:   https://gitee.com/anolis/intel-cloud-kernel.git devel-5.10
head:   c55bd07f747cd457f58e5781279fa11a5fc0add1
commit: bd617fc27c23d34e76440e74b3834c287b878d07 [9/9] anolis: mm: support fast reflink
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20250408/202504081759.bcVX84ca-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250408/202504081759.bcVX84ca-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202504081759.bcVX84ca-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/memory.c: In function 'fr_apply_vma':
>> mm/memory.c:5965:15: warning: unused variable 'pmd' [-Wunused-variable]
    5965 |         pmd_t pmd;
         |               ^~~


vim +/pmd +5965 mm/memory.c

  5956	
  5957	static void fr_apply_vma(struct vm_area_struct *vma)
  5958	{
  5959		struct mm_struct *mm = vma->vm_mm;
  5960		unsigned long start = vma->vm_start;
  5961		unsigned long end = vma->vm_end;
  5962		unsigned long next;
  5963		spinlock_t *pml;
  5964		pmd_t *pmdp = NULL;
> 5965		pmd_t pmd;
  5966		bool applied = false;
  5967	
  5968		do {
  5969			next = pmd_addr_end(start, end);
  5970			if (follow_pmd(mm, start, &pmdp))
  5971				continue;
  5972	
  5973			pml = pmd_lock(mm, pmdp);
  5974			if (pmd_huge(*pmdp)) {
  5975	#ifdef CONFIG_FS_DAX_PMD
  5976				if (!pmd_dirty(*pmdp) && !pmd_write(*pmdp))
  5977					goto unlock_pmd;
  5978	
  5979				pmd = pmdp_invalidate(vma, start, pmdp);
  5980				pmd = pmd_wrprotect(pmd);
  5981				pmd = pmd_mkclean(pmd);
  5982				set_pmd_at(mm, start, pmdp, pmd);
  5983	unlock_pmd:
  5984	#endif
  5985				spin_unlock(pml);
  5986				continue;
  5987			}
  5988	
  5989			if (pmd_none(*pmdp) || unlikely(pmd_bad(*pmdp))) {
  5990				spin_unlock(pml);
  5991				continue;
  5992			}
  5993	
  5994			if (IS_ALIGNED(start, PMD_SIZE) && (start + PMD_SIZE <= end)) {
  5995				pmdp_set_tbl_wrprotect(mm, start, pmdp);
  5996				flush_tlb_range(vma, start, start + PMD_SIZE);
  5997				applied = true;
  5998				spin_unlock(pml);
  5999				continue;
  6000			} else {
  6001				spin_unlock(pml);
  6002				fr_apply_pte_range(vma, pmdp, start, next);
  6003				flush_tlb_range(vma, start, next);
  6004				continue;
  6005			}
  6006		} while (start = next, start != end);
  6007	
  6008		if (applied)
  6009			vma->fast_reflink = applied;
  6010	}
  6011	

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