WARNING: line length of 91 exceeds 80 columns
#68: FILE: tools/lib/bpf/ringbuf.c:165:
+	r->overwrite_pos = r->producer_pos + 1; /* overwrite_pos is next to producer_pos */

CHECK: Blank lines aren't necessary after an open brace '{'
#87: FILE: tools/lib/bpf/ringbuf.c:298:
+{
+

WARNING: memory barrier without comment
#100: FILE: tools/lib/bpf/ringbuf.c:311:
+	cons_pos = smp_load_acquire(r->consumer_pos);

WARNING: memory barrier without comment
#125: FILE: tools/lib/bpf/ringbuf.c:336:
+			prod_pos = smp_load_acquire(r->producer_pos);

WARNING: memory barrier without comment
#159: FILE: tools/lib/bpf/ringbuf.c:370:
+	smp_store_release(r->consumer_pos, cons_pos);

total: 0 errors, 4 warnings, 1 checks, 143 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 83209b41b8b7 ("libbpf: ringbuf: Add overwrite ring buffer process") 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, 4 warnings, 1 checks, 143 lines checked