[tip: timers/core] ntp: Fix prototype in the !CONFIG_GENERIC_CMOS_UPDATE case

[tip-bot2 for Ingo Molnar]

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

Commit-ID:     3cabca87b329cbcbdf295be0094adbd72c7b1f67
Gitweb:        https://git.kernel.org/tip/3cabca87b329cbcbdf295be0094adbd72c7b1f67
Author:        Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate:    Sat, 12 Dec 2020 18:29:20 +01:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Sun, 13 Dec 2020 10:16:31 +01:00

ntp: Fix prototype in the !CONFIG_GENERIC_CMOS_UPDATE case

In the !CONFIG_GENERIC_CMOS_UPDATE case the update_persistent_clock64() function
gets defined as a stub in ntp.c - make the prototype in <linux/timekeeping.h>
conditional on CONFIG_GENERIC_CMOS_UPDATE as well.

Fixes: 76e87d96b30b5 ("ntp: Consolidate the RTC update implementation")
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 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