tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4 head: 134168653ae75b1ccebec6060e2f06f5dae8cea3 commit: 4270eefdbce3770fe5d2bb9d73a89411b67ddaab [42/45] RDMA/mlx5: Use different doorbell memory for different processes config: riscv-allyesconfig (attached as .config) compiler: riscv64-linux-gcc (GCC) 9.3.0 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/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.4 git checkout 4270eefdbce3770fe5d2bb9d73a89411b67ddaab # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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 errors (new ones prefixed by >>): drivers/infiniband/hw/mlx5/doorbell.c: In function 'mlx5_ib_db_map_user': 75 | mmgrab(current->mm); | ^~~~~~ | igrab drivers/infiniband/hw/mlx5/doorbell.c: In function 'mlx5_ib_db_unmap_user': 97 | mmdrop(db->u.user_page->mm); | ^~~~~~ | d_drop cc1: some warnings being treated as errors vim +75 drivers/infiniband/hw/mlx5/doorbell.c 46 47 int mlx5_ib_db_map_user(struct mlx5_ib_ucontext *context, 48 struct ib_udata *udata, unsigned long virt, 49 struct mlx5_db *db) 50 { 51 struct mlx5_ib_user_db_page *page; 52 int err = 0; 53 54 mutex_lock(&context->db_page_mutex); 55 56 list_for_each_entry(page, &context->db_page_list, list) 57 if ((current->mm == page->mm) && 58 (page->user_virt == (virt & PAGE_MASK))) 59 goto found; 60 61 page = kmalloc(sizeof(*page), GFP_KERNEL); 62 if (!page) { 63 err = -ENOMEM; 64 goto out; 65 } 66 67 page->user_virt = (virt & PAGE_MASK); 68 page->refcnt = 0; 69 page->umem = ib_umem_get(udata, virt & PAGE_MASK, PAGE_SIZE, 0, 0); 70 if (IS_ERR(page->umem)) { 71 err = PTR_ERR(page->umem); 72 kfree(page); 73 goto out; 74 } 76 page->mm = current->mm; 77 78 list_add(&page->list, &context->db_page_list); 79 80 found: 81 db->dma = sg_dma_address(page->umem->sg_head.sgl) + (virt & ~PAGE_MASK); 82 db->u.user_page = page; 83 ++page->refcnt; 84 85 out: 86 mutex_unlock(&context->db_page_mutex); 87 88 return err; 89 } 90 91 void mlx5_ib_db_unmap_user(struct mlx5_ib_ucontext *context, struct mlx5_db *db) 92 { 93 mutex_lock(&context->db_page_mutex); 94 95 if (!--db->u.user_page->refcnt) { 96 list_del(&db->u.user_page->list); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org