[anolis-intel-cloud:devel-6.6 0/1] mm/memory.c:6757:15: warning: unused variable 'pmd'

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

tree:   https://gitee.com/anolis/intel-cloud-kernel.git devel-6.6
head:   83b17ccb9899d35bc10eaa78f87da816e711f9e3
commit: f1c74747e787a574212337dae6baea4177ec03e6 [0/1] anolis: mm: support fast reflink
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20250228/202502281619.LbobQJMQ-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/20250228/202502281619.LbobQJMQ-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/202502281619.LbobQJMQ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/memory.c: In function 'fr_apply_vma':
>> mm/memory.c:6757:15: warning: unused variable 'pmd' [-Wunused-variable]
    6757 |         pmd_t pmd;
         |               ^~~


vim +/pmd +6757 mm/memory.c

  6748	
  6749	static void fr_apply_vma(struct vm_area_struct *vma)
  6750	{
  6751		struct mm_struct *mm = vma->vm_mm;
  6752		unsigned long start = vma->vm_start;
  6753		unsigned long end = vma->vm_end;
  6754		unsigned long next;
  6755		spinlock_t *pml;
  6756		pmd_t *pmdp = NULL;
> 6757		pmd_t pmd;
  6758		bool applied = false;
  6759	
  6760		do {
  6761			next = pmd_addr_end(start, end);
  6762			if (follow_pmd(mm, start, &pmdp))
  6763				continue;
  6764	
  6765			pml = pmd_lock(mm, pmdp);
  6766			if (pmd_huge(*pmdp)) {
  6767	#ifdef CONFIG_FS_DAX_PMD
  6768				if (!pmd_dirty(*pmdp) && !pmd_write(*pmdp))
  6769					goto unlock_pmd;
  6770	
  6771				pmd = pmdp_invalidate(vma, start, pmdp);
  6772				pmd = pmd_wrprotect(pmd);
  6773				pmd = pmd_mkclean(pmd);
  6774				set_pmd_at(mm, start, pmdp, pmd);
  6775	unlock_pmd:
  6776	#endif
  6777				spin_unlock(pml);
  6778				continue;
  6779			}
  6780	
  6781			if (pmd_none(*pmdp) || unlikely(pmd_bad(*pmdp))) {
  6782				spin_unlock(pml);
  6783				continue;
  6784			}
  6785	
  6786			if (IS_ALIGNED(start, PMD_SIZE) && (start + PMD_SIZE <= end)) {
  6787				pmdp_set_tbl_wrprotect(mm, start, pmdp);
  6788				flush_tlb_range(vma, start, start + PMD_SIZE);
  6789				applied = true;
  6790				spin_unlock(pml);
  6791				continue;
  6792			} else {
  6793				spin_unlock(pml);
  6794				fr_apply_pte_range(vma, pmdp, start, next);
  6795				flush_tlb_range(vma, start, next);
  6796				continue;
  6797			}
  6798		} while (start = next, start != end);
  6799	
  6800		if (applied)
  6801			vma->fast_reflink = applied;
  6802	}
  6803	

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