CHECK: Please use a blank line after function/struct/union/enum declarations
#68: FILE: include/linux/trace_events.h:834:
 }
+static inline int

CHECK: Prefer using the BIT macro
#120: FILE: kernel/trace/bpf_trace.c:45:
+#define MAX_TRACING_MULTI_CNT (1U << 20)

WARNING: line length of 101 exceeds 80 columns
#129: FILE: kernel/trace/bpf_trace.c:3597:
+#if defined(CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS) && defined(CONFIG_HAVE_SINGLE_FTRACE_DIRECT_OPS)

WARNING: line length of 86 exceeds 80 columns
#184: FILE: kernel/trace/bpf_trace.c:3652:
+		      &bpf_tracing_multi_link_lops, prog, prog->expected_attach_type);

WARNING: line length of 93 exceeds 80 columns
#213: FILE: kernel/trace/bpf_trace.c:3681:
+#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS) && CONFIG_HAVE_SINGLE_FTRACE_DIRECT_OPS */

total: 0 errors, 3 warnings, 2 checks, 174 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 f4c00c45bbea ("bpf: Add support for tracing multi link") 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, 3 warnings, 2 checks, 174 lines checked