CHECK: extern prototypes should be avoided in .h files
#30: FILE: tools/testing/selftests/bpf/bpf_experimental.h:597:
+extern __u64 bpf_clz64(__u64 x) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#31: FILE: tools/testing/selftests/bpf/bpf_experimental.h:598:
+extern __u64 bpf_ctz64(__u64 x) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#32: FILE: tools/testing/selftests/bpf/bpf_experimental.h:599:
+extern __u64 bpf_ffs64(__u64 x) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#33: FILE: tools/testing/selftests/bpf/bpf_experimental.h:600:
+extern __u64 bpf_fls64(__u64 x) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#34: FILE: tools/testing/selftests/bpf/bpf_experimental.h:601:
+extern __u64 bpf_bitrev64(__u64 x) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#35: FILE: tools/testing/selftests/bpf/bpf_experimental.h:602:
+extern __u64 bpf_popcnt64(__u64 x) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#36: FILE: tools/testing/selftests/bpf/bpf_experimental.h:603:
+extern __u64 bpf_rol64(__u64 x, __u64 s) __weak __ksym;

CHECK: extern prototypes should be avoided in .h files
#37: FILE: tools/testing/selftests/bpf/bpf_experimental.h:604:
+extern __u64 bpf_ror64(__u64 x, __u64 s) __weak __ksym;

WARNING: Missing a blank line after declarations
#131: FILE: tools/testing/selftests/bpf/prog_tests/bitops.c:84:
+	int err;
+	LIBBPF_OPTS(bpf_test_run_opts, topts);

total: 0 errors, 1 warnings, 8 checks, 265 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 9cb29c5557a1 ("selftests/bpf: Add tests for 64-bit bitops kfuncs") 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, 1 warnings, 8 checks, 265 lines checked