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Date: Fri, 2 Jul 2021 09:15:24 +0800
From: kernel test robot <lkp@...el.com>
To: Shiraz Saleem <shiraz.saleem@...el.com>
Cc: clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org, Jason Gunthorpe <jgg@...dia.com>
Subject: drivers/infiniband/hw/irdma/uk.c:934:6: warning: variable
'total_size' set but not used
Hi Shiraz,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e04360a2ea01bf42aa639b65aad81f502e896c7f
commit: fa0cf568fd76550c1ddb806c03a65a1a4a1ea909 RDMA/irdma: Add irdma Kconfig/Makefile and remove i40iw
date: 4 weeks ago
config: arm-randconfig-r005-20210701 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project e7e71e9454ed76c1b3d8140170b5333c28bef1be)
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
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fa0cf568fd76550c1ddb806c03a65a1a4a1ea909
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout fa0cf568fd76550c1ddb806c03a65a1a4a1ea909
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> drivers/infiniband/hw/irdma/uk.c:934:6: warning: variable 'total_size' set but not used [-Wunused-but-set-variable]
u32 total_size = 0, wqe_idx, i, byte_off;
^
1 warning generated.
vim +/total_size +934 drivers/infiniband/hw/irdma/uk.c
551c46edc7690c Mustafa Ismail 2021-06-02 925
551c46edc7690c Mustafa Ismail 2021-06-02 926 /**
551c46edc7690c Mustafa Ismail 2021-06-02 927 * irdma_uk_post_receive - post receive wqe
551c46edc7690c Mustafa Ismail 2021-06-02 928 * @qp: hw qp ptr
551c46edc7690c Mustafa Ismail 2021-06-02 929 * @info: post rq information
551c46edc7690c Mustafa Ismail 2021-06-02 930 */
551c46edc7690c Mustafa Ismail 2021-06-02 931 enum irdma_status_code irdma_uk_post_receive(struct irdma_qp_uk *qp,
551c46edc7690c Mustafa Ismail 2021-06-02 932 struct irdma_post_rq_info *info)
551c46edc7690c Mustafa Ismail 2021-06-02 933 {
551c46edc7690c Mustafa Ismail 2021-06-02 @934 u32 total_size = 0, wqe_idx, i, byte_off;
551c46edc7690c Mustafa Ismail 2021-06-02 935 u32 addl_frag_cnt;
551c46edc7690c Mustafa Ismail 2021-06-02 936 __le64 *wqe;
551c46edc7690c Mustafa Ismail 2021-06-02 937 u64 hdr;
551c46edc7690c Mustafa Ismail 2021-06-02 938
551c46edc7690c Mustafa Ismail 2021-06-02 939 if (qp->max_rq_frag_cnt < info->num_sges)
551c46edc7690c Mustafa Ismail 2021-06-02 940 return IRDMA_ERR_INVALID_FRAG_COUNT;
551c46edc7690c Mustafa Ismail 2021-06-02 941
551c46edc7690c Mustafa Ismail 2021-06-02 942 for (i = 0; i < info->num_sges; i++)
551c46edc7690c Mustafa Ismail 2021-06-02 943 total_size += info->sg_list[i].len;
551c46edc7690c Mustafa Ismail 2021-06-02 944
551c46edc7690c Mustafa Ismail 2021-06-02 945 wqe = irdma_qp_get_next_recv_wqe(qp, &wqe_idx);
551c46edc7690c Mustafa Ismail 2021-06-02 946 if (!wqe)
551c46edc7690c Mustafa Ismail 2021-06-02 947 return IRDMA_ERR_QP_TOOMANY_WRS_POSTED;
551c46edc7690c Mustafa Ismail 2021-06-02 948
551c46edc7690c Mustafa Ismail 2021-06-02 949 qp->rq_wrid_array[wqe_idx] = info->wr_id;
551c46edc7690c Mustafa Ismail 2021-06-02 950 addl_frag_cnt = info->num_sges > 1 ? (info->num_sges - 1) : 0;
551c46edc7690c Mustafa Ismail 2021-06-02 951 qp->wqe_ops.iw_set_fragment(wqe, 0, info->sg_list,
551c46edc7690c Mustafa Ismail 2021-06-02 952 qp->rwqe_polarity);
551c46edc7690c Mustafa Ismail 2021-06-02 953
551c46edc7690c Mustafa Ismail 2021-06-02 954 for (i = 1, byte_off = 32; i < info->num_sges; i++) {
551c46edc7690c Mustafa Ismail 2021-06-02 955 qp->wqe_ops.iw_set_fragment(wqe, byte_off, &info->sg_list[i],
551c46edc7690c Mustafa Ismail 2021-06-02 956 qp->rwqe_polarity);
551c46edc7690c Mustafa Ismail 2021-06-02 957 byte_off += 16;
551c46edc7690c Mustafa Ismail 2021-06-02 958 }
551c46edc7690c Mustafa Ismail 2021-06-02 959
551c46edc7690c Mustafa Ismail 2021-06-02 960 /* if not an odd number set valid bit in next fragment */
551c46edc7690c Mustafa Ismail 2021-06-02 961 if (qp->uk_attrs->hw_rev >= IRDMA_GEN_2 && !(info->num_sges & 0x01) &&
551c46edc7690c Mustafa Ismail 2021-06-02 962 info->num_sges) {
551c46edc7690c Mustafa Ismail 2021-06-02 963 qp->wqe_ops.iw_set_fragment(wqe, byte_off, NULL,
551c46edc7690c Mustafa Ismail 2021-06-02 964 qp->rwqe_polarity);
551c46edc7690c Mustafa Ismail 2021-06-02 965 if (qp->uk_attrs->hw_rev == IRDMA_GEN_2)
551c46edc7690c Mustafa Ismail 2021-06-02 966 ++addl_frag_cnt;
551c46edc7690c Mustafa Ismail 2021-06-02 967 }
551c46edc7690c Mustafa Ismail 2021-06-02 968
551c46edc7690c Mustafa Ismail 2021-06-02 969 set_64bit_val(wqe, 16, 0);
551c46edc7690c Mustafa Ismail 2021-06-02 970 hdr = FIELD_PREP(IRDMAQPSQ_ADDFRAGCNT, addl_frag_cnt) |
551c46edc7690c Mustafa Ismail 2021-06-02 971 FIELD_PREP(IRDMAQPSQ_VALID, qp->rwqe_polarity);
551c46edc7690c Mustafa Ismail 2021-06-02 972
551c46edc7690c Mustafa Ismail 2021-06-02 973 dma_wmb(); /* make sure WQE is populated before valid bit is set */
551c46edc7690c Mustafa Ismail 2021-06-02 974
551c46edc7690c Mustafa Ismail 2021-06-02 975 set_64bit_val(wqe, 24, hdr);
551c46edc7690c Mustafa Ismail 2021-06-02 976
551c46edc7690c Mustafa Ismail 2021-06-02 977 return 0;
551c46edc7690c Mustafa Ismail 2021-06-02 978 }
551c46edc7690c Mustafa Ismail 2021-06-02 979
:::::: The code at line 934 was first introduced by commit
:::::: 551c46edc7690c1656fbe44ef770ec4e6c004215 RDMA/irdma: Add user/kernel shared libraries
:::::: TO: Mustafa Ismail <mustafa.ismail@...el.com>
:::::: CC: Jason Gunthorpe <jgg@...dia.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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