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@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>

+2
+2
include/linux/timekeeping.h
··· 303 303 extern void read_persistent_clock64(struct timespec64 *ts); 304 304 void read_persistent_wall_and_boot_offset(struct timespec64 *wall_clock, 305 305 struct timespec64 *boot_offset); 306 + #ifdef CONFIG_GENERIC_CMOS_UPDATE 306 307 extern int update_persistent_clock64(struct timespec64 now); 308 + #endif 307 309 308 310 #endif