WARNING: line length of 84 exceeds 80 columns
#77: FILE: tools/testing/selftests/bpf/prog_tests/tracing_multi.c:475:
+	/* extra count (+1 for each fexit execution) for test_result_fexit cookie */

WARNING: line length of 84 exceeds 80 columns
#84: FILE: tools/testing/selftests/bpf/prog_tests/tracing_multi.c:482:
+	/* extra count (+1 for each fexit execution) for test_result_fexit cookie */

CHECK: Please don't use multiple blank lines
#87: FILE: tools/testing/selftests/bpf/prog_tests/tracing_multi.c:485:
+
+

WARNING: line length of 93 exceeds 80 columns
#115: FILE: tools/testing/selftests/bpf/progs/tracing_multi_session_attach.c:8:
+__hidden extern void tracing_multi_arg_check(__u64 *ctx, __u64 *test_result, bool is_return);

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#123: FILE: tools/testing/selftests/bpf/progs/tracing_multi_session_attach.c:16:
+	volatile __u64 *cookie = bpf_session_cookie(ctx);

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#139: FILE: tools/testing/selftests/bpf/progs/tracing_multi_session_attach.c:32:
+	volatile __u64 *cookie = bpf_session_cookie(ctx);

total: 0 errors, 5 warnings, 1 checks, 115 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 ed7b9868a3eb ("selftests/bpf: Add tracing multi session 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, 5 warnings, 1 checks, 115 lines checked