WARNING: externs should be avoided in .c files
#56: FILE: tools/testing/selftests/bpf/progs/test_ringbuf_write.c:13:
+extern bool CONFIG_ARM64_64K_PAGES __kconfig __weak;

WARNING: line length of 94 exceeds 80 columns
#66: FILE: tools/testing/selftests/bpf/progs/test_ringbuf_write.c:31:
+	sample1 = bpf_ringbuf_reserve(&ringbuf, CONFIG_ARM64_64K_PAGES ? 0x30000 : 0x3000, 0);

WARNING: line length of 94 exceeds 80 columns
#72: FILE: tools/testing/selftests/bpf/progs/test_ringbuf_write.c:36:
+	sample2 = bpf_ringbuf_reserve(&ringbuf, CONFIG_ARM64_64K_PAGES ? 0x30000 : 0x3000, 0);

total: 0 errors, 3 warnings, 0 checks, 45 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 bfac98cb02a4 ("selftests/bpf: Fix ringbuf/ringbuf_write test failure with arm64 64KB page size") 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, 0 checks, 45 lines checked