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author | Jeff Garzik <jgarzik@pobox.com> | 2006-02-20 07:16:23 (GMT) |
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committer | Jeff Garzik <jgarzik@pobox.com> | 2006-02-20 07:16:23 (GMT) |
commit | 5b2ffed906a3ebd4e52a5bbef06b99a517c53e4b (patch) | |
tree | 2f900f89d93db6b0822d8bdf4f49851c581c12a6 /kernel/timer.c | |
parent | f1b318793dcd2d9ff6b5ac06e7762098fa079cee (diff) | |
parent | bd71c2b17468a2531fb4c81ec1d73520845e97e1 (diff) | |
download | linux-fsl-qoriq-5b2ffed906a3ebd4e52a5bbef06b99a517c53e4b.tar.xz |
Merge branch 'master'
Diffstat (limited to 'kernel/timer.c')
-rw-r--r-- | kernel/timer.c | 39 |
1 files changed, 34 insertions, 5 deletions
diff --git a/kernel/timer.c b/kernel/timer.c index b9dad39..fe3a9a9 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -717,12 +717,16 @@ static void second_overflow(void) #endif } -/* in the NTP reference this is called "hardclock()" */ -static void update_wall_time_one_tick(void) +/* + * Returns how many microseconds we need to add to xtime this tick + * in doing an adjustment requested with adjtime. + */ +static long adjtime_adjustment(void) { - long time_adjust_step, delta_nsec; + long time_adjust_step; - if ((time_adjust_step = time_adjust) != 0 ) { + time_adjust_step = time_adjust; + if (time_adjust_step) { /* * We are doing an adjtime thing. Prepare time_adjust_step to * be within bounds. Note that a positive time_adjust means we @@ -733,10 +737,19 @@ static void update_wall_time_one_tick(void) */ time_adjust_step = min(time_adjust_step, (long)tickadj); time_adjust_step = max(time_adjust_step, (long)-tickadj); + } + return time_adjust_step; +} +/* in the NTP reference this is called "hardclock()" */ +static void update_wall_time_one_tick(void) +{ + long time_adjust_step, delta_nsec; + + time_adjust_step = adjtime_adjustment(); + if (time_adjust_step) /* Reduce by this step the amount of time left */ time_adjust -= time_adjust_step; - } delta_nsec = tick_nsec + time_adjust_step * 1000; /* * Advance the phase, once it gets to one microsecond, then @@ -759,6 +772,22 @@ static void update_wall_time_one_tick(void) } /* + * Return how long ticks are at the moment, that is, how much time + * update_wall_time_one_tick will add to xtime next time we call it + * (assuming no calls to do_adjtimex in the meantime). + * The return value is in fixed-point nanoseconds with SHIFT_SCALE-10 + * bits to the right of the binary point. + * This function has no side-effects. + */ +u64 current_tick_length(void) +{ + long delta_nsec; + + delta_nsec = tick_nsec + adjtime_adjustment() * 1000; + return ((u64) delta_nsec << (SHIFT_SCALE - 10)) + time_adj; +} + +/* * Using a loop looks inefficient, but "ticks" is * usually just one (we shouldn't be losing ticks, * we're doing this this way mainly for interrupt |