posix-timers: Remove useless res field from k_clock

The res member of kclock is only used by mmtimer.c, but even there it
contains redundant information. Remove the field and fixup mmtimer.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <johnstul@us.ibm.com>
Tested-by: Richard Cochran <richard.cochran@omicron.at>
LKML-Reference: <20110201134418.808714587@linutronix.de>

drivers/char/mmtimer.c

@@ -768,12 +768,11 @@ static int sgi_timer_set(struct k_itimer *timr, int flags,
 static int sgi_clock_getres(const clockid_t which_clock, struct timespec *tp)
 {
 	tp->tv_sec = 0;
-	tp->tv_nsec = sgi_clock.res;
+	tp->tv_nsec = sgi_clock_period;
 	return 0;
 }
 
 static struct k_clock sgi_clock = {
-	.res = 0,
 	.clock_set	= sgi_clock_set,
 	.clock_get	= sgi_clock_get,
 	.clock_getres	= sgi_clock_getres,
@@ -840,7 +839,7 @@ static int __init mmtimer_init(void)
 			(unsigned long) node);
 	}
 
-	sgi_clock_period = sgi_clock.res = NSEC_PER_SEC / sn_rtc_cycles_per_second;
+	sgi_clock_period = NSEC_PER_SEC / sn_rtc_cycles_per_second;
 	register_posix_clock(CLOCK_SGI_CYCLE, &sgi_clock);
 
 	printk(KERN_INFO "%s: v%s, %ld MHz\n", MMTIMER_DESC, MMTIMER_VERSION,

include/linux/posix-timers.h

@@ -67,7 +67,6 @@ struct k_itimer {
 };
 
 struct k_clock {
-	int res;		/* in nanoseconds */
 	int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
 	int (*clock_set) (const clockid_t which_clock,
 			  const struct timespec *tp);

kernel/posix-timers.c

@@ -204,8 +204,6 @@ static inline int invalid_clockid(const clockid_t which_clock)
 		return 1;
 	if (posix_clocks[which_clock].clock_getres != NULL)
 		return 0;
-	if (posix_clocks[which_clock].res != 0)
-		return 0;
 	return 1;
 }