WARNING: line length of 87 exceeds 80 columns
#53: FILE: tools/testing/selftests/bpf/prog_tests/bpf_iter.c:267:
+	// This includes the parent thread, this thread, and the do_nothing_wait thread

CHECK: Comparison to NULL could be written "ret"
#72: FILE: tools/testing/selftests/bpf/prog_tests/bpf_iter.c:285:
+	ASSERT_FALSE(pthread_join(thread_id, &ret) || ret != NULL,

total: 0 errors, 1 warnings, 1 checks, 53 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 f3b66afbb1d9 ("bpf: properly test iter/task tid filtering") 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, 1 warnings, 1 checks, 53 lines checked