WARNING: 'occured' may be misspelled - perhaps 'occurred'?
#13: 
Hence, if M >= N, no segmentation occured.
                                  ^^^^^^^

WARNING: line length of 117 exceeds 80 columns
#60: FILE: tools/testing/selftests/net/netfilter/nf_queue.c:34:
+	printf("Usage: %s [-c|-v [-vv] ] [-o] [-t timeout] [-q queue_num] [-Qdst_queue ] [ -d ms_delay ] [-G]\n", p);

WARNING: line length of 108 exceeds 80 columns
#109: FILE: tools/testing/selftests/net/netfilter/nft_queue.sh:634:
+	timeout "$timeout" ip netns exec "$ns2" socat UDP-LISTEN:12346,fork,pf=ipv4 OPEN:"$TMPFILE1",trunc &

WARNING: line length of 91 exceeds 80 columns
#113: FILE: tools/testing/selftests/net/netfilter/nft_queue.sh:637:
+	ip netns exec "$nsrouter" nice -n -19 ./nf_queue -G -c -q 1 -o -t 2 > "$TMPFILE2" &

WARNING: line length of 91 exceeds 80 columns
#127: FILE: tools/testing/selftests/net/netfilter/nft_queue.sh:651:
+	dd if=/dev/zero bs="$bs" count="$count" 2>/dev/null | for i in $(seq 1 $nprocs); do

total: 0 errors, 5 warnings, 0 checks, 73 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 ac3f20a400d4 ("selftests: netfilter: nft_queue.sh: avoid flakes on debug kernels") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES 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, 5 warnings, 0 checks, 73 lines checked