WARNING: 'prefered' may be misspelled - perhaps 'preferred'?
#6: 
These are the prefered way to copy ethtool strings.
              ^^^^^^^^

total: 0 errors, 1 warnings, 0 checks, 203 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 766fe66b997c ("net: dsa: use ethtool string helpers") 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, 0 checks, 203 lines checked