ERROR: Bad function definition - void test_tailcall_failure() should probably be void test_tailcall_failure(void)
#34: FILE: tools/testing/selftests/bpf/prog_tests/tailcalls.c:1650:
+static void test_tailcall_failure()

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#50: 
new file mode 100644

CHECK: No space is necessary after a cast
#65: FILE: tools/testing/selftests/bpf/progs/tailcall_fail.c:11:
+extern void bpf_rcu_read_lock(void) __ksym;

CHECK: No space is necessary after a cast
#66: FILE: tools/testing/selftests/bpf/progs/tailcall_fail.c:12:
+extern void bpf_rcu_read_unlock(void) __ksym;

ERROR: Macros with complex values should be enclosed in parentheses
#68: FILE: tools/testing/selftests/bpf/progs/tailcall_fail.c:14:
+#define private(name) SEC(".bss." #name) __hidden __attribute__((aligned(8)))

WARNING: Prefer __aligned(8) over __attribute__((aligned(8)))
#68: FILE: tools/testing/selftests/bpf/progs/tailcall_fail.c:14:
+#define private(name) SEC(".bss." #name) __hidden __attribute__((aligned(8)))

total: 2 errors, 2 warnings, 2 checks, 88 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 f795b068db78 ("selftests/bpf: Add tests for tail calls with locks and refs") 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.