[tip: timers/core] ntp: Fix build error

[tip-bot2 for Ingo Molnar]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     a3356a079da268cd35460d9bfe052c74383e179b
Gitweb:        https://git.kernel.org/tip/a3356a079da268cd35460d9bfe052c74383e179b
Author:        Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate:    Sat, 12 Dec 2020 18:29:20 +01:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Sat, 12 Dec 2020 18:35:12 +01:00

ntp: Fix build error

Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 include/linux/timekeeping.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 7f7e4a3..929d3f3 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -303,6 +303,8 @@ extern int persistent_clock_is_local;
 extern void read_persistent_clock64(struct timespec64 *ts);
 void read_persistent_wall_and_boot_offset(struct timespec64 *wall_clock,
 					  struct timespec64 *boot_offset);
+#ifdef CONFIG_GENERIC_CMOS_UPDATE
 extern int update_persistent_clock64(struct timespec64 now);
+#endif
 
 #endif