[axboe-block:io_uring-rsrc 6/6] io_uring/rsrc.c:1086:22: warning: variable 'offset' set but not used

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git io_uring-rsrc
head:   8b0d733b6f3b938e1fef6b8abc3bc9dcefb73551
commit: 8b0d733b6f3b938e1fef6b8abc3bc9dcefb73551 [6/6] io_uring/rsrc: add request -> io_rsrc_node mapper
config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20241030/202410301242.hwd3CISE-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/20241030/202410301242.hwd3CISE-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/202410301242.hwd3CISE-lkp@intel.com/

All warnings (new ones prefixed by >>):

   io_uring/rsrc.c: In function 'io_rsrc_map_request':
>> io_uring/rsrc.c:1086:22: warning: variable 'offset' set but not used [-Wunused-but-set-variable]
    1086 |         unsigned int offset;
         |                      ^~~~~~


vim +/offset +1086 io_uring/rsrc.c

  1078	
  1079	struct io_rsrc_node *io_rsrc_map_request(struct io_ring_ctx *ctx,
  1080						 struct request *req,
  1081						 void (*kbuf_fn)(struct io_rsrc_node *))
  1082	{
  1083		struct io_mapped_ubuf *imu = NULL;
  1084		struct io_rsrc_node *node = NULL;
  1085		struct req_iterator rq_iter;
> 1086		unsigned int offset;
  1087		struct bio_vec bv;
  1088		int nr_bvecs;
  1089	
  1090		if (!bio_has_data(req->bio))
  1091			goto out;
  1092	
  1093		nr_bvecs = 0;
  1094		rq_for_each_bvec(bv, req, rq_iter)
  1095			nr_bvecs++;
  1096		if (!nr_bvecs)
  1097			goto out;
  1098	
  1099		node = io_rsrc_node_alloc(ctx, IORING_RSRC_KBUFFER);
  1100		if (!node)
  1101			goto out;
  1102		node->buf = NULL;
  1103	
  1104		imu = kvmalloc(struct_size(imu, bvec, nr_bvecs), GFP_NOIO);
  1105		if (!imu)
  1106			goto out;
  1107	
  1108		imu->ubuf = 0;
  1109		imu->len = 0;
  1110		if (req->bio != req->biotail) {
  1111			int idx = 0;
  1112	
  1113			offset = 0;
  1114			rq_for_each_bvec(bv, req, rq_iter) {
  1115				imu->bvec[idx++] = bv;
  1116				imu->len += bv.bv_len;
  1117			}
  1118		} else {
  1119			struct bio *bio = req->bio;
  1120	
  1121			offset = bio->bi_iter.bi_bvec_done;
  1122			imu->bvec[0] = *__bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter);
  1123			imu->len = imu->bvec[0].bv_len;
  1124		}
  1125		imu->nr_bvecs = nr_bvecs;
  1126		imu->folio_shift = PAGE_SHIFT;
  1127		refcount_set(&imu->refs, 1);
  1128		node->buf = imu;
  1129		node->kbuf_fn = kbuf_fn;
  1130		return node;
  1131	out:
  1132		if (node)
  1133			io_put_rsrc_node(node);
  1134		kfree(imu);
  1135		return NULL;
  1136	}
  1137	

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