CHECK: extern prototypes should be avoided in .h files
#49: FILE: include/linux/timekeeping.h:321:
+extern bool ktime_real_to_base_clock(ktime_t treal,

CHECK: extern prototypes should be avoided in .h files
#51: FILE: include/linux/timekeeping.h:323:
+extern bool timekeeping_clocksource_has_base(enum clocksource_ids id);

WARNING: line length of 90 exceeds 80 columns
#91: FILE: kernel/time/timekeeping.c:1259:
+ * ktime_real_to_base_clock() - Convert CLOCK_REALTIME timestamp to a base clock timestamp

WARNING: line length of 90 exceeds 80 columns
#96: FILE: kernel/time/timekeeping.c:1264:
+ * Converts a supplied, future realtime clock value to the corresponding base clock value.

WARNING: line length of 87 exceeds 80 columns
#100: FILE: kernel/time/timekeeping.c:1268:
+bool ktime_real_to_base_clock(ktime_t treal, enum clocksource_ids base_id, u64 *cycles)

WARNING: line length of 82 exceeds 80 columns
#148: FILE: kernel/time/timekeeping.c:1420:
+			ret = (tk_core.timekeeper.tkr_mono.clock->base->id == id);

total: 0 errors, 4 warnings, 2 checks, 108 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 23d3c6ab482f ("timekeeping: Add function to convert realtime to base clock") 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, 4 warnings, 2 checks, 108 lines checked