WARNING: 'unkown' may be misspelled - perhaps 'unknown'?
#54: 
  // sign bit is unkown, so we treat upper bits [63,8] as unknown
                 ^^^^^^

WARNING: braces {} are not necessary for single statement blocks
#101: FILE: kernel/bpf/tnum.c:169:
+	if (size >= 8) {
+		return a;
+	}

total: 0 errors, 2 warnings, 0 checks, 44 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 14703d157b4d ("bpf: Introduce tnum_scast as a tnum native sign extension helper") 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, 2 warnings, 0 checks, 44 lines checked