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powerpc/time: Use clocksource_register_hz

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Use clocksource_register_hz which calculates the shift/mult
factors for us. Also remove the shift = 22 assumption in
vsyscall_update - thanks to Paul Mackerras and John Stultz for
catching that.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-11-23 20:07:19 +00:00 committed by Benjamin Herrenschmidt
parent d8afc6fd95
commit 11b8633ada
1 changed files with 3 additions and 10 deletions
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13
arch/powerpc/kernel/time.c
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@ -86,8 +86,6 @@ static struct clocksource clocksource_rtc = {
.rating = 400,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.mask = CLOCKSOURCE_MASK(64),
.shift = 22,
.mult = 0, /* To be filled in */
.read = rtc_read,
};
@ -97,8 +95,6 @@ static struct clocksource clocksource_timebase = {
.rating = 400,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.mask = CLOCKSOURCE_MASK(64),
.shift = 22,
.mult = 0, /* To be filled in */
.read = timebase_read,
};
@ -822,9 +818,8 @@ void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
++vdso_data->tb_update_count;
smp_mb();
/* XXX this assumes clock->shift == 22 */
/* 4611686018 ~= 2^(20+64-22) / 1e9 */
new_tb_to_xs = (u64) mult * 4611686018ULL;
/* 19342813113834067 ~= 2^(20+64) / 1e9 */
new_tb_to_xs = (u64) mult * (19342813113834067ULL >> clock->shift);
new_stamp_xsec = (u64) wall_time->tv_nsec * XSEC_PER_SEC;
do_div(new_stamp_xsec, 1000000000);
new_stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC;
@ -875,9 +870,7 @@ static void __init clocksource_init(void)
else
clock = &clocksource_timebase;
clock->mult = clocksource_hz2mult(tb_ticks_per_sec, clock->shift);
if (clocksource_register(clock)) {
if (clocksource_register_hz(clock, tb_ticks_per_sec)) {
printk(KERN_ERR "clocksource: %s is already registered\n",
clock->name);
return;