[xiang-linux:erofs/compr_cfgs 6/6] fs/erofs/super.c:202:17: sparse: sparse: restricted __le16 degrades to integer

[xiang-linux:erofs/compr_cfgs 6/6] fs/erofs/super.c:202:17: sparse: sparse: restricted __le16 degrades to integer

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git erofs/compr_cfgs
head:   5a5727580c28124069723d6166dc6551acc1adf2
commit: 5a5727580c28124069723d6166dc6551acc1adf2 [6/6] erofs: introduce on-disk compression options
config: x86_64-randconfig-s021-20210228 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-241-geaceeafa-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git/commit/?id=5a5727580c28124069723d6166dc6551acc1adf2
        git remote add xiang-linux https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git
        git fetch --no-tags xiang-linux erofs/compr_cfgs
        git checkout 5a5727580c28124069723d6166dc6551acc1adf2
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


"sparse warnings: (new ones prefixed by >>)"
>> fs/erofs/super.c:202:17: sparse: sparse: restricted __le16 degrades to integer

vim +202 fs/erofs/super.c

   187	
   188	#ifdef CONFIG_EROFS_FS_ZIP
   189	static int erofs_load_compr_cfgs(struct super_block *sb,
   190					 struct erofs_super_block *dsb)
   191	{
   192		struct erofs_sb_info *sbi;
   193		struct page *page;
   194		unsigned int algs, alg;
   195		erofs_off_t offset;
   196		int size, ret;
   197	
   198		sbi = EROFS_SB(sb);
   199		sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
   200	
   201		if (sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS) {
 > 202			erofs_err(sb,
   203	"try to load compressed image with unsupported algorithms %x",
   204				  dsb->u1.available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS);
   205			return -EINVAL;
   206		}
   207	
   208		offset = EROFS_SUPER_OFFSET + sbi->sb_size;
   209		page = NULL;
   210		alg = 0;
   211		ret = 0;
   212	
   213		for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
   214			void *data;
   215	
   216			if (!(algs & 1))
   217				continue;
   218	
   219			data = erofs_read_metadata(sb, &page, &offset, &size);
   220			if (IS_ERR(data)) {
   221				ret = PTR_ERR(data);
   222				goto err;
   223			}
   224	
   225			switch (alg) {
   226			case Z_EROFS_COMPRESSION_LZ4:
   227				ret = z_erofs_load_lz4_config(sb, dsb, data, size);
   228				break;
   229			default:
   230				DBG_BUGON(1);
   231				ret = -EFAULT;
   232			}
   233			kfree(data);
   234			if (ret)
   235				goto err;
   236		}
   237	err:
   238		if (page) {
   239			unlock_page(page);
   240			put_page(page);
   241		}
   242		return ret;
   243	}
   244	#else
   245	static int erofs_load_compr_cfgs(struct super_block *sb,
   246					 struct erofs_super_block *dsb)
   247	{
   248		if (dsb->u1.available_compr_algs) {
   249			erofs_err(sb,
   250	"try to load compressed image when compression is disabled");
   251			return -EINVAL;
   252		}
   253		return 0;
   254	}
   255	#endif
   256	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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