CHECK: Please use a blank line after function/struct/union/enum declarations
#89: FILE: include/linux/filter.h:1084:
+}
+static inline int sk_filter_reason(struct sock *sk, struct sk_buff *skb,

CHECK: Please don't use multiple blank lines
#95: FILE: include/linux/filter.h:1090:
 
+

WARNING: line length of 83 exceeds 80 columns
#123: FILE: include/net/tcp.h:1563:
+int tcp_filter(struct sock *sk, struct sk_buff *skb, enum skb_drop_reason *reason);

ERROR: do not use assignment in if condition
#233: FILE: net/core/sock.c:580:
+	} else if ((err = sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf)))) {

ERROR: do not use assignment in if condition
#268: FILE: net/ipv4/tcp_ipv4.c:2139:
+	if (unlikely((err = sk_add_backlog(sk, skb, limit)))) {

WARNING: line length of 82 exceeds 80 columns
#286: FILE: net/ipv4/tcp_ipv4.c:2154:
+int tcp_filter(struct sock *sk, struct sk_buff *skb, enum skb_drop_reason *reason)

WARNING: line length of 82 exceeds 80 columns
#431: FILE: net/rose/rose_in.c:166:
+			if (sk_filter_trim_cap(sk, skb, ROSE_MIN_LEN, &dr) == 0 &&

total: 2 errors, 3 warnings, 2 checks, 316 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 f02d794dd82d ("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.