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[PATCH] generic: vsyscall-gtod support for GENERIC_TIME

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Provides generic infrastructure for vsyscall-gtod.

[akpm@osdl.org: cleanup]
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@muc.de>
Cc: Roman Zippel <zippel@linux-m68k.org>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
john stultz 2007-02-16 01:28:17 -08:00 committed by Linus Torvalds
parent 88ad0bf689
commit acc9a9dcdd
2 changed files with 11 additions and 0 deletions
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10
include/linux/clocksource.h
View File

@ -47,6 +47,7 @@ struct clocksource;
* @mult: cycle to nanosecond multiplier
* @shift: cycle to nanosecond divisor (power of two)
* @flags: flags describing special properties
* @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 mult;
u32 shift;
unsigned long flags;
cycle_t (*vread)(void);
/* timekeeping specific data, ignore */
cycle_t cycle_last, cycle_interval;
@ -197,4 +199,12 @@ extern int clocksource_register(struct clocksource*);
extern struct clocksource* clocksource_get_next(void);
extern void clocksource_change_rating(struct clocksource *cs, int rating);
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
extern void update_vsyscall(struct timespec *ts, struct clocksource *c);
#else
static inline void update_vsyscall(struct timespec *ts, struct clocksource *c)
{
}
#endif
#endif /* _LINUX_CLOCKSOURCE_H */

1
kernel/timer.c
View File

@ -1174,6 +1174,7 @@ static void update_wall_time(void)
/* check to see if there is a new clocksource to use */
change_clocksource();
update_vsyscall(&xtime, clock);
}
/*