WARNING: externs should be avoided in .c files
#59: FILE: tools/testing/selftests/bpf/bench.c:561:
+extern const struct bench bench_bpf_rhashmap_full_update;

WARNING: externs should be avoided in .c files
#65: FILE: tools/testing/selftests/bpf/bench.c:567:
+extern const struct bench bench_bpf_rhashmap_lookup;

WARNING: externs should be avoided in .c files
#68: FILE: tools/testing/selftests/bpf/bench.c:570:
+extern const struct bench bench_rhtab_mem;

total: 0 errors, 3 warnings, 0 checks, 214 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 2979114edb2d ("selftests/bpf: Add resizable hashmap to benchmarks") 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, 3 warnings, 0 checks, 214 lines checked