[rppt:unmapped-alloc/rfc-v1 5/5] mm/secretmem.c:56:23: warning: unused variable 'addr'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git unmapped-alloc/rfc-v1
head:   c10ae02315f6ea2dd0b6c74a8ba82ea7ca33cda2
commit: c10ae02315f6ea2dd0b6c74a8ba82ea7ca33cda2 [5/5] EXPERIMENTAL: mm/secretmem: use __GFP_UNMAPPED
config: x86_64-buildonly-randconfig-r001-20230306 (https://download.01.org/0day-ci/archive/20230307/202303072217.EtTWF7gn-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/rppt/linux.git/commit/?id=c10ae02315f6ea2dd0b6c74a8ba82ea7ca33cda2
        git remote add rppt https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git
        git fetch --no-tags rppt unmapped-alloc/rfc-v1
        git checkout c10ae02315f6ea2dd0b6c74a8ba82ea7ca33cda2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303072217.EtTWF7gn-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/secretmem.c: In function 'secretmem_fault':
>> mm/secretmem.c:56:23: warning: unused variable 'addr' [-Wunused-variable]
      56 |         unsigned long addr;
         |                       ^~~~


vim +/addr +56 mm/secretmem.c

9a436f8ff6316c Mike Rapoport       2021-07-07  49  
1507f51255c9ff Mike Rapoport       2021-07-07  50  static vm_fault_t secretmem_fault(struct vm_fault *vmf)
1507f51255c9ff Mike Rapoport       2021-07-07  51  {
1507f51255c9ff Mike Rapoport       2021-07-07  52  	struct address_space *mapping = vmf->vma->vm_file->f_mapping;
1507f51255c9ff Mike Rapoport       2021-07-07  53  	struct inode *inode = file_inode(vmf->vma->vm_file);
1507f51255c9ff Mike Rapoport       2021-07-07  54  	pgoff_t offset = vmf->pgoff;
1507f51255c9ff Mike Rapoport       2021-07-07  55  	gfp_t gfp = vmf->gfp_mask;
1507f51255c9ff Mike Rapoport       2021-07-07 @56  	unsigned long addr;
1507f51255c9ff Mike Rapoport       2021-07-07  57  	struct page *page;
84ac013046ccc4 Mike Rapoport       2022-07-07  58  	vm_fault_t ret;
1507f51255c9ff Mike Rapoport       2021-07-07  59  	int err;
1507f51255c9ff Mike Rapoport       2021-07-07  60  
1507f51255c9ff Mike Rapoport       2021-07-07  61  	if (((loff_t)vmf->pgoff << PAGE_SHIFT) >= i_size_read(inode))
1507f51255c9ff Mike Rapoport       2021-07-07  62  		return vmf_error(-EINVAL);
1507f51255c9ff Mike Rapoport       2021-07-07  63  
84ac013046ccc4 Mike Rapoport       2022-07-07  64  	filemap_invalidate_lock_shared(mapping);
84ac013046ccc4 Mike Rapoport       2022-07-07  65  
1507f51255c9ff Mike Rapoport       2021-07-07  66  retry:
1507f51255c9ff Mike Rapoport       2021-07-07  67  	page = find_lock_page(mapping, offset);
1507f51255c9ff Mike Rapoport       2021-07-07  68  	if (!page) {
c10ae02315f6ea Mike Rapoport (IBM  2022-11-17  69) 		page = alloc_page(gfp | __GFP_ZERO | __GFP_UNMAPPED);
84ac013046ccc4 Mike Rapoport       2022-07-07  70  		if (!page) {
84ac013046ccc4 Mike Rapoport       2022-07-07  71  			ret = VM_FAULT_OOM;
84ac013046ccc4 Mike Rapoport       2022-07-07  72  			goto out;
84ac013046ccc4 Mike Rapoport       2022-07-07  73  		}
1507f51255c9ff Mike Rapoport       2021-07-07  74  
1507f51255c9ff Mike Rapoport       2021-07-07  75  		__SetPageUptodate(page);
1507f51255c9ff Mike Rapoport       2021-07-07  76  		err = add_to_page_cache_lru(page, mapping, offset, gfp);
1507f51255c9ff Mike Rapoport       2021-07-07  77  		if (unlikely(err)) {
1507f51255c9ff Mike Rapoport       2021-07-07  78  			put_page(page);
1507f51255c9ff Mike Rapoport       2021-07-07  79  			if (err == -EEXIST)
1507f51255c9ff Mike Rapoport       2021-07-07  80  				goto retry;
1507f51255c9ff Mike Rapoport       2021-07-07  81  
84ac013046ccc4 Mike Rapoport       2022-07-07  82  			ret = vmf_error(err);
84ac013046ccc4 Mike Rapoport       2022-07-07  83  			goto out;
1507f51255c9ff Mike Rapoport       2021-07-07  84  		}
1507f51255c9ff Mike Rapoport       2021-07-07  85  	}
1507f51255c9ff Mike Rapoport       2021-07-07  86  
1507f51255c9ff Mike Rapoport       2021-07-07  87  	vmf->page = page;
84ac013046ccc4 Mike Rapoport       2022-07-07  88  	ret = VM_FAULT_LOCKED;
84ac013046ccc4 Mike Rapoport       2022-07-07  89  
84ac013046ccc4 Mike Rapoport       2022-07-07  90  out:
84ac013046ccc4 Mike Rapoport       2022-07-07  91  	filemap_invalidate_unlock_shared(mapping);
84ac013046ccc4 Mike Rapoport       2022-07-07  92  	return ret;
1507f51255c9ff Mike Rapoport       2021-07-07  93  }
1507f51255c9ff Mike Rapoport       2021-07-07  94  

:::::: The code at line 56 was first introduced by commit
:::::: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 mm: introduce memfd_secret system call to create "secret" memory areas

:::::: TO: Mike Rapoport <rppt@linux.ibm.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

-- 
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https://github.com/intel/lkp-tests