WARNING: Missing a blank line after declarations
#33: FILE: tools/testing/selftests/bpf/prog_tests/timer_start_deadlock.c:10:
+	int err, prog_fd;
+	LIBBPF_OPTS(bpf_test_run_opts, opts);

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#84: FILE: tools/testing/selftests/bpf/progs/timer_start_deadlock.c:22:
+volatile int in_timer_start;

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#85: FILE: tools/testing/selftests/bpf/progs/timer_start_deadlock.c:23:
+volatile int tp_called;

ERROR: do not initialise statics to false
#96: FILE: tools/testing/selftests/bpf/progs/timer_start_deadlock.c:34:
+	static bool called = false;

total: 1 errors, 3 warnings, 0 checks, 108 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 0add693276df ("selftests/bpf: Add a testcase for deadlock avoidance") 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.