WARNING: line length of 81 exceeds 80 columns
#70: FILE: drivers/ptp/ptp_chardev.c:348:
+static long ptp_sys_offset_precise_attrs(struct ptp_clock *ptp, void __user *arg)

WARNING: line length of 82 exceeds 80 columns
#167: FILE: drivers/ptp/ptp_chardev.c:449:
+static long ptp_sys_offset_extended_attrs(struct ptp_clock *ptp, void __user *arg)

WARNING: line length of 82 exceeds 80 columns
#223: FILE: drivers/ptp/ptp_chardev.c:505:
+	return copy_to_user(arg, extoffattrs, sizeof(*extoffattrs)) ? -EFAULT : 0;

total: 0 errors, 3 warnings, 0 checks, 505 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 fc84191a652d ("ptp: Add ioctls for PHC timestamps with quality attributes") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES 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, 505 lines checked