WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#21: 
new file mode 100644

WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#26: FILE: tools/testing/selftests/bpf/prog_tests/so_timestamping.c:1:
+#define _GNU_SOURCE

WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#130: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:1:
+#include "vmlinux.h"

CHECK: Please don't use multiple blank lines
#175: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:46:
+
+

WARNING: line length of 84 exceeds 80 columns
#231: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:102:
+	n = bpf_loop(ARRAY_SIZE(sol_socket_tests), bpf_test_socket_sockopt, &lc, 0);

CHECK: multiple assignments should be avoided
#272: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:143:
+		delay = val->sched_delay = timestamp - val->sendmsg_ns;

CHECK: multiple assignments should be avoided
#276: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:147:
+		delay = val->sw_snd_delay = timestamp - prior_ts;

WARNING: line length of 82 exceeds 80 columns
#279: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:150:
+		prior_ts = val->sw_snd_delay + val->sched_delay + val->sendmsg_ns;

CHECK: multiple assignments should be avoided
#280: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:151:
+		delay = val->ack_delay = timestamp - prior_ts;

WARNING: line length of 88 exceeds 80 columns
#299: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:170:
+int BPF_PROG(trace_tcp_sendmsg_locked, struct sock *sk, struct msghdr *msg, size_t size)

total: 0 errors, 6 warnings, 4 checks, 325 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 e474e38ee821 ("bpf: add simple bpf tests in the tx path for so_timestamping feature") 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, 6 warnings, 4 checks, 325 lines checked