WARNING: externs should be avoided in .c files
#76: FILE: tools/testing/selftests/bpf/bench.c:544:
+extern const struct bench bench_rb_prod;

WARNING: line length of 86 exceeds 80 columns
#143: FILE: tools/testing/selftests/bpf/benchs/bench_ringbufs.c:108:
+		fprintf(stderr, "overwite mode only works with benchmakr rb-prod!\n");

WARNING: line length of 83 exceeds 80 columns
#153: FILE: tools/testing/selftests/bpf/benchs/bench_ringbufs.c:118:
+		fprintf(stderr, "back-to-back mode makes no sense for rb-prod!\n");

WARNING: line length of 85 exceeds 80 columns
#163: FILE: tools/testing/selftests/bpf/benchs/bench_ringbufs.c:128:
+		fprintf(stderr, "benchmarks excluding rb-prod need one consumer!\n");

WARNING: line length of 100 exceeds 80 columns
#288: FILE: tools/testing/selftests/bpf/benchs/run_bench_ringbufs.sh:54:
+	summarize "rb-prod nr_prod $b" "$($RUN_BENCH -p$b --rb-batch-cnt 50 --rb-overwrite rb-prod)"

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#298: FILE: tools/testing/selftests/bpf/progs/ringbuf_bench.c:17:
+const volatile long bench_prod = 0;

WARNING: Prefer __aligned(128) over __attribute__((aligned(128)))
#302: FILE: tools/testing/selftests/bpf/progs/ringbuf_bench.c:21:
+long hits __attribute__((aligned(128))) = 0;

total: 0 errors, 7 warnings, 0 checks, 232 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 3c91416349cf ("selftests/bpf/benchs: Add producer and overwrite bench for ring buffer") 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, 7 warnings, 0 checks, 232 lines checked