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Subjectdrivers/scsi/scsi_transport_fc.c:908:6: warning: variable 'desc_cnt' set but not used
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: ed4643521e6af8ab8ed1e467630a85884d2696cf
commit: 3dcfe0de5a9752e646a61f4ce513ac059960c7c3 scsi: fc: Parse FPIN packets and update statistics
date: 1 year, 5 months ago
config: i386-randconfig-c001 (https://download.01.org/0day-ci/archive/20220325/202203250040.RHMqwHeT-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3dcfe0de5a9752e646a61f4ce513ac059960c7c3
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 3dcfe0de5a9752e646a61f4ce513ac059960c7c3
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/scsi/

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

All warnings (new ones prefixed by >>):

>> drivers/scsi/scsi_transport_fc.c:908:6: warning: variable 'desc_cnt' set but not used [-Wunused-but-set-variable]
u32 desc_cnt = 0, bytes_remain;
^
1 warning generated.


vim +/desc_cnt +908 drivers/scsi/scsi_transport_fc.c

893
894 /**
895 * fc_host_rcv_fpin - routine to process a received FPIN.
896 * @shost: host the FPIN was received on
897 * @fpin_len: length of FPIN payload, in bytes
898 * @fpin_buf: pointer to FPIN payload
899 *
900 * Notes:
901 * This routine assumes no locks are held on entry.
902 */
903 void
904 fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
905 {
906 struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
907 struct fc_tlv_desc *tlv;
> 908 u32 desc_cnt = 0, bytes_remain;
909 u32 dtag;
910
911 /* Update Statistics */
912 tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
913 bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
914 bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
915
916 while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
917 bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
918 dtag = be32_to_cpu(tlv->desc_tag);
919 switch (dtag) {
920 case ELS_DTAG_LNK_INTEGRITY:
921 fc_fpin_li_stats_update(shost, tlv);
922 break;
923 case ELS_DTAG_DELIVERY:
924 fc_fpin_delivery_stats_update(shost, tlv);
925 break;
926 case ELS_DTAG_PEER_CONGEST:
927 fc_fpin_peer_congn_stats_update(shost, tlv);
928 break;
929 case ELS_DTAG_CONGESTION:
930 fc_fpin_congn_stats_update(shost, tlv);
931 }
932
933 desc_cnt++;
934 bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
935 tlv = fc_tlv_next_desc(tlv);
936 }
937
938 fc_host_post_fc_event(shost, fc_get_event_number(),
939 FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
940 }
941 EXPORT_SYMBOL(fc_host_fpin_rcv);
942
943

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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