CHECK: DEFINE_MUTEX definition without comment
#34: FILE: tools/testing/selftests/net/bench/page_pool/bench_page_pool_simple.c:20:
+DEFINE_MUTEX(wait_for_tasklet);

total: 0 errors, 0 warnings, 1 checks, 164 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 e3b5911717b6 ("page_pool: add benchmarking for napi-based recycling") 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, 0 warnings, 1 checks, 164 lines checked