WARNING: line length of 87 exceeds 80 columns
#34: FILE: tools/testing/selftests/bpf/bpf_experimental.h:602:
+extern int bpf_iter_wakeup_source_new(struct bpf_iter_wakeup_source *it) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#34: FILE: tools/testing/selftests/bpf/bpf_experimental.h:602:
+extern int bpf_iter_wakeup_source_new(struct bpf_iter_wakeup_source *it) __weak __ksym;

CHECK: Lines should not end with a '('
#35: FILE: tools/testing/selftests/bpf/bpf_experimental.h:603:
+extern struct wakeup_source *bpf_iter_wakeup_source_next(

CHECK: extern prototypes should be avoided in .h files
#35: FILE: tools/testing/selftests/bpf/bpf_experimental.h:603:
+extern struct wakeup_source *bpf_iter_wakeup_source_next(

WARNING: line length of 92 exceeds 80 columns
#37: FILE: tools/testing/selftests/bpf/bpf_experimental.h:605:
+extern void bpf_iter_wakeup_source_destroy(struct bpf_iter_wakeup_source *it) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#37: FILE: tools/testing/selftests/bpf/bpf_experimental.h:605:
+extern void bpf_iter_wakeup_source_destroy(struct bpf_iter_wakeup_source *it) __weak __ksym;

total: 0 errors, 2 warnings, 4 checks, 132 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 0424fc3d5b8d ("selftests/bpf: Open coded BPF wakeup_sources test") 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, 2 warnings, 4 checks, 132 lines checked