Messages in this thread Patch in this message | | | Date | Tue, 8 Aug 2006 22:17:14 -0400 | From | john stultz <> | Subject | [RFC][PATCH 1/6] x86_64: Enable arch-generic vsyscall support. |
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Provides generic infrastructure for vsyscall-gtod.
Signed-off-by: John Stultz <johnstul@us.ibm.com>
include/linux/clocksource.h | 2 ++ kernel/timer.c | 7 +++++++ 2 files changed, 9 insertions(+)
linux-2.6.18-rc4_timeofday-vsyscall-support_C5.patch ============================================ diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index d852024..f554273 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -46,6 +46,7 @@ typedef u64 cycle_t; * @shift: cycle to nanosecond divisor (power of two) * @update_callback: called when safe to alter clocksource values * @is_continuous: defines if clocksource is free-running. + * @vread: vsyscall based read * @cycle_interval: Used internally by timekeeping core, please ignore. * @xtime_interval: Used internally by timekeeping core, please ignore. */ @@ -59,6 +60,7 @@ struct clocksource { u32 shift; int (*update_callback)(void); int is_continuous; + cycle_t (*vread)(void); /* timekeeping specific data, ignore */ cycle_t cycle_last, cycle_interval; diff --git a/kernel/timer.c b/kernel/timer.c index b650f04..08b4a02 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -1023,6 +1023,12 @@ static int __init timekeeping_init_devic device_initcall(timekeeping_init_device); +#ifdef CONFIG_GENERIC_TIME_VSYSCALL +extern void update_vsyscall(struct timespec* ts, struct clocksource* c); +#else +#define update_vsyscall(now, c) +#endif + /* * If the error is already larger, we look ahead even further * to compensate for late or lost adjustments. @@ -1165,6 +1171,7 @@ static void update_wall_time(void) clock->xtime_nsec = 0; clocksource_calculate_interval(clock, tick_nsec); } + update_vsyscall(&xtime, clock); } /* - 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/
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