==========
checkpatch - FAILED

WARNING: line length of 83 exceeds 80 columns
#131: FILE: include/net/tcp.h:1562:
+int tcp_filter(struct sock *sk, struct sk_buff *skb, enum skb_drop_reason *reason);

ERROR: do not use assignment in if condition
#267: FILE: net/core/sock.c:582:
+	} else if ((err = sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf)))) {

WARNING: line length of 82 exceeds 80 columns
#321: FILE: net/ipv4/tcp_ipv4.c:2155:
+int tcp_filter(struct sock *sk, struct sk_buff *skb, enum skb_drop_reason *reason)

total: 1 errors, 2 warnings, 0 checks, 333 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 4e0ea0126d53 ("net: track pfmemalloc drops via SKB_DROP_REASON_PFMEMALLOC") 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.