CHECK: No space is necessary after a cast
#26: FILE: tools/testing/selftests/bpf/bpf_kfuncs.h:80:
+extern __u64 *bpf_session_cookie(void) __ksym;

CHECK: extern prototypes should be avoided in .h files
#26: FILE: tools/testing/selftests/bpf/bpf_kfuncs.h:80:
+extern __u64 *bpf_session_cookie(void) __ksym;

WARNING: Missing a blank line after declarations
#47: FILE: tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c:380:
+	struct kprobe_multi_session_cookie *skel = NULL;
+	LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#87: 
new file mode 100644

total: 0 errors, 2 warnings, 2 checks, 112 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 d623d37564bc ("selftests/bpf: Add kprobe multi wrapper cookie test") 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, 2 warnings, 2 checks, 112 lines checked