CHECK: Please use a blank line after function/struct/union/enum declarations
#76: FILE: include/net/udp.h:316:
+}
+static inline void udp4_hash4(struct sock *sk)

WARNING: line length of 82 exceeds 80 columns
#105: FILE: net/ipv4/udp.c:491:
+static void udp_rehash4(struct udp_table *udptable, struct sock *sk, u16 newhash4)

WARNING: line length of 89 exceeds 80 columns
#132: FILE: net/ipv4/udp.c:518:
+	/* Because SLAB_TYPESAFE_BY_RCU is not used, we don't need to touch sk_refcnt. */

WARNING: line length of 95 exceeds 80 columns
#139: FILE: net/ipv4/udp.c:525:
+	/* if the nulls value we got at the end of this lookup is not the expected one, we must

WARNING: line length of 97 exceeds 80 columns
#140: FILE: net/ipv4/udp.c:526:
+	 * restart lookup. We probably met an item that was moved to another chain due to rehash.

WARNING: line length of 85 exceeds 80 columns
#148: FILE: net/ipv4/udp.c:534:
+/* In hash4, rehash can also happen in connect(), where hash4_cnt keeps unchanged. */

WARNING: line length of 82 exceeds 80 columns
#149: FILE: net/ipv4/udp.c:535:
+static void udp_rehash4(struct udp_table *udptable, struct sock *sk, u16 newhash4)

WARNING: line length of 91 exceeds 80 columns
#164: FILE: net/ipv4/udp.c:550:
+		hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_lrpa_node, &nhslot4->nulls_head);

WARNING: line length of 98 exceeds 80 columns
#195: FILE: net/ipv4/udp.c:581:
+	/* Connected udp socket can re-connect to another remote address, so rehash4 is needed. */

WARNING: line length of 82 exceeds 80 columns
#212: FILE: net/ipv4/udp.c:598:
+	hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_lrpa_node, &hslot4->nulls_head);

WARNING: line length of 90 exceeds 80 columns
#232: FILE: net/ipv4/udp.c:618:
+	hash = udp_ehashfn(net, sk->sk_rcv_saddr, sk->sk_num, sk->sk_daddr, sk->sk_dport);

WARNING: line length of 95 exceeds 80 columns
#246: FILE: net/ipv4/udp.c:640:
+		result = udp4_lib_lookup4(net, saddr, sport, daddr, hnum, dif, sdif, udptable);

total: 0 errors, 11 warnings, 1 checks, 268 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit ce554e7790dd ("ipv4/udp: Add 4-tuple hash for connected socket") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 11 warnings, 1 checks, 268 lines checked