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

ERROR: code indent should use tabs where possible
#73: FILE: include/net/addrconf.h:41:
+^I^I^I ^Irouteraddr : 1,$

WARNING: please, no space before tabs
#73: FILE: include/net/addrconf.h:41:
+^I^I^I ^Irouteraddr : 1,$

ERROR: code indent should use tabs where possible
#80: FILE: include/net/addrconf.h:47:
+^I^I^I ^Irouteraddr : 1,$

WARNING: please, no space before tabs
#80: FILE: include/net/addrconf.h:47:
+^I^I^I ^Irouteraddr : 1,$

WARNING: line length of 94 exceeds 80 columns
#117: FILE: net/ipv6/addrconf.c:2870:
+	ignore_autoconf_flag = READ_ONCE(in6_dev->cnf.accept_pio_pflag) && pinfo->pdpreferred;

total: 2 errors, 3 warnings, 0 checks, 84 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 8a594a5e9675 ("Add support for PIO p flag") 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.