Re: [PATCH v3 46/49] fs/btrfs: convert to bio_for_each_segment_all_sp()

[kbuild test robot]

Hi Ming,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.13-rc4 next-20170810]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ming-Lei/block-support-multipage-bvec/20170810-110521
config: x86_64-randconfig-b0-08112217 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   fs/btrfs/raid56.c: In function 'find_logical_bio_stripe':
>> fs/btrfs/raid56.c:1368: warning: unused variable 'bia'

vim +/bia +1368 fs/btrfs/raid56.c

  1356	
  1357	/*
  1358	 * helper to find the stripe number for a given
  1359	 * bio (before mapping).  Used to figure out which stripe has
  1360	 * failed.  This looks up based on logical block numbers.
  1361	 */
  1362	static int find_logical_bio_stripe(struct btrfs_raid_bio *rbio,
  1363					   struct bio *bio)
  1364	{
  1365		u64 logical = bio->bi_iter.bi_sector;
  1366		u64 stripe_start;
  1367		int i;
> 1368		struct bvec_iter_all bia;
  1369	
  1370		logical <<= 9;
  1371	
  1372		for (i = 0; i < rbio->nr_data; i++) {
  1373			stripe_start = rbio->bbio->raid_map[i];
  1374			if (logical >= stripe_start &&
  1375			    logical < stripe_start + rbio->stripe_len) {
  1376				return i;
  1377			}
  1378		}
  1379		return -1;
  1380	}
  1381	

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