From: Tony Breeds I'm working on a clocksource implementation for all powerpc platforms. some of these platforms needs to do a little work as part of the settimeofday() syscall and I can't see a way to do that without adding this hook to clocksource. From: Tony Breeds Add per clocksource hook to settimeofday(). Some clocksources need to do extra work as part of the settimeofday call, this hook make it easy to do so. Signed-off-by: Tony Breeds Signed-off-by: Thomas Gleixner Cc: john stultz --- include/linux/clocksource.h | 3 +++ kernel/time/timekeeping.c | 3 +++ 2 files changed, 6 insertions(+) Index: linux-2.6.22-rc4-mm/include/linux/clocksource.h =================================================================== --- linux-2.6.22-rc4-mm.orig/include/linux/clocksource.h 2007-06-16 12:10:21.000000000 +0200 +++ linux-2.6.22-rc4-mm/include/linux/clocksource.h 2007-06-16 12:10:24.000000000 +0200 @@ -50,6 +50,7 @@ struct clocksource; * @flags: flags describing special properties * @vread: vsyscall based read * @resume: resume function for the clocksource, if necessary + * @settimeofday: [Optional] Do arch specific work during do_settimeofday * @cycle_interval: Used internally by timekeeping core, please ignore. * @xtime_interval: Used internally by timekeeping core, please ignore. */ @@ -68,6 +69,8 @@ struct clocksource { cycle_t (*vread)(void); void (*resume)(void); + void (*settimeofday)(struct clocksource *cs, struct timespec *ts); + /* timekeeping specific data, ignore */ cycle_t cycle_interval; u64 xtime_interval; Index: linux-2.6.22-rc4-mm/kernel/time/timekeeping.c =================================================================== --- linux-2.6.22-rc4-mm.orig/kernel/time/timekeeping.c 2007-06-16 12:10:23.000000000 +0200 +++ linux-2.6.22-rc4-mm/kernel/time/timekeeping.c 2007-06-16 12:10:24.000000000 +0200 @@ -159,6 +159,9 @@ int do_settimeofday(struct timespec *tv) clock->error = 0; ntp_clear(); + if (clock->settimeofday) + clock->settimeofday(clock, tv); + update_vsyscall(&xtime, clock); write_sequnlock_irqrestore(&xtime_lock, flags); -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/