==========
checkpatch - FAILED

ERROR: trailing whitespace
#59: FILE: Documentation/networking/net_cachelines/net_device.rst:169:
+unsigned_long:1                     netns_local                                                     $

total: 1 errors, 0 warnings, 0 checks, 415 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.

NOTE: Whitespace errors detected.
      You may wish to use scripts/cleanpatch or scripts/cleanfile

Commit d586063f2612 ("netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local") 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.