CHECK: Lines should not end with a '('
#46: FILE: tools/testing/selftests/bpf/progs/btf_type_tag_percpu.c:64:
+	rstat = (struct css_rstat_cpu *)bpf_per_cpu_ptr(

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#51: FILE: tools/testing/selftests/bpf/progs/btf_type_tag_percpu.c:68:
+		*(volatile long *)rstat;

total: 0 errors, 1 warnings, 1 checks, 18 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 628e488e36c2 ("selftests/bpf: Fix selftest btf_tag/btf_type_tag_percpu_vmlinux_helper failure") 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, 1 warnings, 1 checks, 18 lines checked