tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: cd560d8023bf73c94d755908c8d4a0994dd1ec34 commit: 86dd9868b8788a9063893a97649594af93cd5aa6 [11556/11658] net: dsa: tag_rtl4_a: Support also egress tags config: i386-randconfig-s002-20210215 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 86dd9868b8788a9063893a97649594af93cd5aa6 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 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 >>)" net/dsa/tag_rtl4_a.c:57:12: sparse: expected unsigned short [usertype] net/dsa/tag_rtl4_a.c:57:12: sparse: got restricted __be16 [usertype] net/dsa/tag_rtl4_a.c:63:12: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned short [usertype] @@ got restricted __be16 [usertype] @@ net/dsa/tag_rtl4_a.c:63:12: sparse: expected unsigned short [usertype] net/dsa/tag_rtl4_a.c:63:12: sparse: got restricted __be16 [usertype] vim +57 net/dsa/tag_rtl4_a.c 33 34 static struct sk_buff *rtl4a_tag_xmit(struct sk_buff *skb, 35 struct net_device *dev) 36 { 37 struct dsa_port *dp = dsa_slave_to_port(dev); 38 u8 *tag; 39 u16 *p; 40 u16 out; 41 42 /* Pad out to at least 60 bytes */ 43 if (unlikely(eth_skb_pad(skb))) 44 return NULL; 45 if (skb_cow_head(skb, RTL4_A_HDR_LEN) < 0) 46 return NULL; 47 48 netdev_dbg(dev, "add realtek tag to package to port %d\n", 49 dp->index); 50 skb_push(skb, RTL4_A_HDR_LEN); 51 52 memmove(skb->data, skb->data + RTL4_A_HDR_LEN, 2 * ETH_ALEN); 53 tag = skb->data + 2 * ETH_ALEN; 54 55 /* Set Ethertype */ 56 p = (u16 *)tag; 58 59 out = (RTL4_A_PROTOCOL_RTL8366RB << 12) | (2 << 8); 60 /* The lower bits is the port numer */ 61 out |= (u8)dp->index; 62 p = (u16 *)(tag + 2); 63 *p = htons(out); 64 65 return skb; 66 } 67 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org