WARNING: line length of 94 exceeds 80 columns
#27: FILE: tools/testing/selftests/bpf/progs/iters_testmod.c:128:
+__failure __msg("kernel func bpf_kfunc_ret_rcu_test requires RCU critical section protection")

WARNING: line length of 103 exceeds 80 columns
#50: FILE: tools/testing/selftests/bpf/progs/iters_testmod.c:151:
+__failure __msg("kernel func bpf_kfunc_ret_rcu_test_nostruct requires RCU critical section protection")

WARNING: line length of 83 exceeds 80 columns
#97: FILE: tools/testing/selftests/bpf/test_kmods/bpf_testmod.c:637:
+BTF_ID_FLAGS(func, bpf_kfunc_ret_rcu_test_nostruct, KF_RET_NULL | KF_RCU_PROTECTED)

CHECK: No space is necessary after a cast
#109: FILE: tools/testing/selftests/bpf/test_kmods/bpf_testmod_kfunc.h:161:
+struct task_struct *bpf_kfunc_ret_rcu_test(void) __ksym;

total: 0 errors, 3 warnings, 1 checks, 81 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 708d180c926c ("selftests/bpf: Add tests for KF_RCU_PROTECTED") 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, 3 warnings, 1 checks, 81 lines checked