tree: https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git rdma-next head: 0757f2af90704cd86cbc7d1f98a5af5a1d9f38b1 commit: 5315266b49aa1483481880854ff075a79053f477 [55/57] RDMA/uverbs: Remove redundant assignments config: riscv-randconfig-r012-20200719 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu git checkout 5315266b49aa1483481880854ff075a79053f477 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): if (cmd.flags & IB_MR_REREG_PD) { ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/infiniband/core/uverbs_cmd.c:811:28: note: uninitialized use occurs here cmd.access_flags, pd, ^~ drivers/infiniband/core/uverbs_cmd.c:799:2: note: remove the 'if' if its condition is always true if (cmd.flags & IB_MR_REREG_PD) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/infiniband/core/uverbs_cmd.c:764:18: note: initialize the variable 'pd' to silence this warning struct ib_pd *pd; ^ = NULL 1 warning generated. vim +799 drivers/infiniband/core/uverbs_cmd.c bc38a6abdd5a50 Roland Dreier 2005-07-07 759 974d6b4b2bc33c Jason Gunthorpe 2018-11-25 760 static int ib_uverbs_rereg_mr(struct uverbs_attr_bundle *attrs) 7e6edb9b2e0bcf Matan Barak 2014-07-31 761 { 7e6edb9b2e0bcf Matan Barak 2014-07-31 762 struct ib_uverbs_rereg_mr cmd; 7e6edb9b2e0bcf Matan Barak 2014-07-31 763 struct ib_uverbs_rereg_mr_resp resp; 5315266b49aa14 Leon Romanovsky 2020-07-19 764 struct ib_pd *pd; 7e6edb9b2e0bcf Matan Barak 2014-07-31 765 struct ib_mr *mr; 7e6edb9b2e0bcf Matan Barak 2014-07-31 766 struct ib_pd *old_pd; 7e6edb9b2e0bcf Matan Barak 2014-07-31 767 int ret; 7e6edb9b2e0bcf Matan Barak 2014-07-31 768 struct ib_uobject *uobj; 7e6edb9b2e0bcf Matan Barak 2014-07-31 769 3c2c20947ddbb8 Jason Gunthorpe 2018-11-25 770 ret = uverbs_request(attrs, &cmd, sizeof(cmd)); 3c2c20947ddbb8 Jason Gunthorpe 2018-11-25 771 if (ret) 3c2c20947ddbb8 Jason Gunthorpe 2018-11-25 772 return ret; 7e6edb9b2e0bcf Matan Barak 2014-07-31 773 7e6edb9b2e0bcf Matan Barak 2014-07-31 774 if (cmd.flags & ~IB_MR_REREG_SUPPORTED || !cmd.flags) 7e6edb9b2e0bcf Matan Barak 2014-07-31 775 return -EINVAL; 7e6edb9b2e0bcf Matan Barak 2014-07-31 776 7e6edb9b2e0bcf Matan Barak 2014-07-31 777 if ((cmd.flags & IB_MR_REREG_TRANS) && 7e6edb9b2e0bcf Matan Barak 2014-07-31 778 (!cmd.start || !cmd.hca_va || 0 >= cmd.length || 7e6edb9b2e0bcf Matan Barak 2014-07-31 779 (cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))) 7e6edb9b2e0bcf Matan Barak 2014-07-31 780 return -EINVAL; 7e6edb9b2e0bcf Matan Barak 2014-07-31 781 8313c10fa8be03 Jason Gunthorpe 2018-11-25 782 uobj = uobj_get_write(UVERBS_OBJECT_MR, cmd.mr_handle, attrs); fd3c7904db6e05 Matan Barak 2017-04-04 783 if (IS_ERR(uobj)) fd3c7904db6e05 Matan Barak 2017-04-04 784 return PTR_ERR(uobj); 7e6edb9b2e0bcf Matan Barak 2014-07-31 785 7e6edb9b2e0bcf Matan Barak 2014-07-31 786 mr = uobj->object; 7e6edb9b2e0bcf Matan Barak 2014-07-31 787 5ccbf63f87a39c Ariel Levkovich 2018-04-26 788 if (mr->dm) { 5ccbf63f87a39c Ariel Levkovich 2018-04-26 789 ret = -EINVAL; 5ccbf63f87a39c Ariel Levkovich 2018-04-26 790 goto put_uobjs; 5ccbf63f87a39c Ariel Levkovich 2018-04-26 791 } 5ccbf63f87a39c Ariel Levkovich 2018-04-26 792 7e6edb9b2e0bcf Matan Barak 2014-07-31 793 if (cmd.flags & IB_MR_REREG_ACCESS) { 7e6edb9b2e0bcf Matan Barak 2014-07-31 794 ret = ib_check_mr_access(cmd.access_flags); 7e6edb9b2e0bcf Matan Barak 2014-07-31 795 if (ret) 7e6edb9b2e0bcf Matan Barak 2014-07-31 796 goto put_uobjs; 7e6edb9b2e0bcf Matan Barak 2014-07-31 797 } 7e6edb9b2e0bcf Matan Barak 2014-07-31 798 7e6edb9b2e0bcf Matan Barak 2014-07-31 @799 if (cmd.flags & IB_MR_REREG_PD) { 2cc1e3b80942a7 Jason Gunthorpe 2018-07-04 800 pd = uobj_get_obj_read(pd, UVERBS_OBJECT_PD, cmd.pd_handle, 8313c10fa8be03 Jason Gunthorpe 2018-11-25 801 attrs); 7e6edb9b2e0bcf Matan Barak 2014-07-31 802 if (!pd) { 7e6edb9b2e0bcf Matan Barak 2014-07-31 803 ret = -EINVAL; 7e6edb9b2e0bcf Matan Barak 2014-07-31 804 goto put_uobjs; 7e6edb9b2e0bcf Matan Barak 2014-07-31 805 } 7e6edb9b2e0bcf Matan Barak 2014-07-31 806 } 7e6edb9b2e0bcf Matan Barak 2014-07-31 807 25fd08eb2be0fc Leon Romanovsky 2019-02-21 808 old_pd = mr->pd; 3023a1e93656c0 Kamal Heib 2018-12-10 809 ret = mr->device->ops.rereg_user_mr(mr, cmd.flags, cmd.start, 3023a1e93656c0 Kamal Heib 2018-12-10 810 cmd.length, cmd.hca_va, 3023a1e93656c0 Kamal Heib 2018-12-10 811 cmd.access_flags, pd, ef87df2c7a8f04 Jason Gunthorpe 2018-11-25 812 &attrs->driver_udata); e278173fd19eb5 Yuval Shaia 2019-02-18 813 if (ret) e278173fd19eb5 Yuval Shaia 2019-02-18 814 goto put_uobj_pd; e278173fd19eb5 Yuval Shaia 2019-02-18 815 7e6edb9b2e0bcf Matan Barak 2014-07-31 816 if (cmd.flags & IB_MR_REREG_PD) { 7e6edb9b2e0bcf Matan Barak 2014-07-31 817 atomic_inc(&pd->usecnt); 7e6edb9b2e0bcf Matan Barak 2014-07-31 818 mr->pd = pd; 7e6edb9b2e0bcf Matan Barak 2014-07-31 819 atomic_dec(&old_pd->usecnt); 7e6edb9b2e0bcf Matan Barak 2014-07-31 820 } 7e6edb9b2e0bcf Matan Barak 2014-07-31 821 04c0a5fcfcf65a Yishai Hadas 2020-06-30 822 if (cmd.flags & IB_MR_REREG_TRANS) 04c0a5fcfcf65a Yishai Hadas 2020-06-30 823 mr->iova = cmd.hca_va; 04c0a5fcfcf65a Yishai Hadas 2020-06-30 824 7e6edb9b2e0bcf Matan Barak 2014-07-31 825 memset(&resp, 0, sizeof(resp)); 7e6edb9b2e0bcf Matan Barak 2014-07-31 826 resp.lkey = mr->lkey; 7e6edb9b2e0bcf Matan Barak 2014-07-31 827 resp.rkey = mr->rkey; 7e6edb9b2e0bcf Matan Barak 2014-07-31 828 9a0738575f2691 Jason Gunthorpe 2018-11-25 829 ret = uverbs_response(attrs, &resp, sizeof(resp)); 7e6edb9b2e0bcf Matan Barak 2014-07-31 830 7e6edb9b2e0bcf Matan Barak 2014-07-31 831 put_uobj_pd: 7e6edb9b2e0bcf Matan Barak 2014-07-31 832 if (cmd.flags & IB_MR_REREG_PD) fd3c7904db6e05 Matan Barak 2017-04-04 833 uobj_put_obj_read(pd); 7e6edb9b2e0bcf Matan Barak 2014-07-31 834 7e6edb9b2e0bcf Matan Barak 2014-07-31 835 put_uobjs: fd3c7904db6e05 Matan Barak 2017-04-04 836 uobj_put_write(uobj); 7e6edb9b2e0bcf Matan Barak 2014-07-31 837 7e6edb9b2e0bcf Matan Barak 2014-07-31 838 return ret; 7e6edb9b2e0bcf Matan Barak 2014-07-31 839 } 7e6edb9b2e0bcf Matan Barak 2014-07-31 840 :::::: The code at line 799 was first introduced by commit :::::: 7e6edb9b2e0bcfb2a588db390c44d120213c57ae IB/core: Add user MR re-registration support :::::: TO: Matan Barak <matanb(a)mellanox.com&gt; :::::: CC: Roland Dreier <roland(a)purestorage.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org