[kbuild-all] [acrn:4.19/lts 25/85] drivers/i2c/busses/i2c-virtio.c:75:24: sparse: sparse: incorrect type in assignment (different base types)

tree: https://github.com/projectacrn/acrn-kernel 4.19/lts head: 8abec6c5ebdace7220ecfa35b317c76f62e29c31 commit: d91916aa26f01021b2eaaabbe7ab5429bba4c6c9 [25/85] add support for virtio-i2c FE driver config: alpha-randconfig-s032-20200811 (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-168-g9554805c-dirty git checkout d91916aa26f01021b2eaaabbe7ab5429bba4c6c9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=alpha If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/i2c/busses/i2c-virtio.c:167:40: sparse: sparse: restricted __virtio16 degrades to integer drivers/i2c/busses/i2c-virtio.c:168:75: sparse: got restricted __virtio16 [usertype] len drivers/i2c/busses/i2c-virtio.c: note: in included file (through include/linux/bitops.h, include/linux/kernel.h, include/linux/list.h, ...): arch/alpha/include/asm/bitops.h:380:13: sparse: sparse: undefined identifier '__builtin_alpha_cmpbge' arch/alpha/include/asm/bitops.h:382:13: sparse: sparse: undefined identifier '__builtin_alpha_extbl' drivers/i2c/busses/i2c-virtio.c: In function 'virtio_i2c_probe': drivers/i2c/busses/i2c-virtio.c:236:17: warning: unused variable 'pdev' [-Wunused-variable] 236 | struct device *pdev = vdev->dev.parent; | ^~~~ vim +75 drivers/i2c/busses/i2c-virtio.c 67 68 static int virtio_queue_add_msg(struct virtqueue *vq, 69 struct virtio_i2c_msg *vmsg, 70 struct i2c_msg *msg) 71 { 72 struct scatterlist *sgs[3], hdr, bout, bin, status; 73 int outcnt = 0, incnt = 0; 74 78 79 if (vmsg->hdr.len) 81 82 sg_init_one(&hdr, &vmsg->hdr, sizeof(struct virtio_i2c_hdr)); 83 sgs[outcnt++] = &hdr; 84 if (vmsg->buf) { 86 sg_init_one(&bin, vmsg->buf, msg->len); 87 sgs[outcnt + incnt++] = &bin; 88 } else { 89 memcpy(vmsg->buf, msg->buf, msg->len); 90 sg_init_one(&bout, vmsg->buf, msg->len); 91 sgs[outcnt++] = &bout; 92 } 93 } 94 sg_init_one(&status, &vmsg->status, 1); 95 sgs[outcnt + incnt++] = &status; 96 97 return virtqueue_add_sgs(vq, sgs, outcnt, incnt, vmsg, GFP_KERNEL); 98 } 99 100 static int virtio_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) 101 { 102 struct virtio_i2c *virtio_i2c = i2c_get_adapdata(adap); 103 struct virtqueue *vq = virtio_i2c->msg_vq.vq; 104 struct virtio_i2c_msg *vmsg, *msg_r; 105 int len, i, ret; 106 unsigned long time_left; 107 108 ret = 0; 109 if (unlikely(!vq)) 110 return ret; 111 112 vmsg = kzalloc(sizeof(*vmsg), GFP_KERNEL); 113 if (unlikely(!vmsg)) 114 return ret; 115 116 mutex_lock(&virtio_i2c->i2c_lock); 117 vmsg->buf = NULL; 118 for (i = 0; i < num; i++) { 119 dev_dbg(&adap->dev, 120 "start to add msg[%d]: addr:0x%x\n", 121 i, 122 msgs[i].addr); 123 124 ret = virtio_queue_add_msg(vq, vmsg, &msgs[i]); 125 if (ret) { 126 dev_err(&adap->dev, 127 "failed to add msg[%d] to virtqueue\n", 128 i); 129 ret = 0; 130 goto err; 131 } 132 133 virtqueue_kick(vq); 134 dev_dbg(&adap->dev, "wait for complete...\n"); 135 /*wait for complete*/ 136 time_left = wait_for_completion_timeout(&virtio_i2c->completion, 137 adap->timeout); 138 if (!time_left) { 139 dev_err(&adap->dev, 140 "msg[%d]: addr=0x%x timeout\n", 141 i, 142 msgs[i].addr); 143 ret = i ? (i - 1) : 0; 144 goto err; 145 } 146 msg_r = (struct virtio_i2c_msg *)virtqueue_get_buf(vq, &len); 147 if (msg_r) { 148 /* msg_r should point to the same address with vmsg */ 149 if (msg_r != vmsg) { 150 dev_err(&adap->dev, 151 "msg[%d]: addr=0x%x virtqueue error\n", 152 i, 153 msg_r->hdr.addr); 154 ret = i - 1; 155 goto err; 156 } 157 158 if (msg_r->status != VIRTIO_I2C_MSG_OK) { 159 dev_dbg(&adap->dev, 160 "msg[%d]: addr=0x%x error=%d\n", 161 i, 162 msg_r->hdr.addr, 163 msg_r->status); 164 ret = i - 1; 165 goto err; 166 } 167 if ((msg_r->hdr.flags & I2C_M_RD) && msg_r->hdr.len) 169 kfree(msg_r->buf); 170 msg_r->buf = NULL; 171 } 172 reinit_completion(&virtio_i2c->completion); 173 dev_dbg(&adap->dev, "msg[%d] ok\n", i); 174 } 175 if (i == num) 176 ret = num; 177 178 err: 179 mutex_unlock(&virtio_i2c->i2c_lock); 180 if (vmsg) { 181 kfree(vmsg->buf); 182 vmsg->buf = NULL; 183 kfree(vmsg); 184 } 185 return ret; 186 } 187 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org