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| author | Roman Zippel <zippel@linux-m68k.org> | 2008-05-01 13:34:26 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-05-01 17:03:58 +0200 |
| commit | 71abb3af62dfa52930755f3b6497eafbe1d6ec85 (patch) | |
| tree | 8e37f74017b800127538f6620820ea90b53169b5 /kernel/time/ntp.c | |
| parent | introduce explicit signed/unsigned 64bit divide (diff) | |
| download | linux-71abb3af62dfa52930755f3b6497eafbe1d6ec85.tar.xz linux-71abb3af62dfa52930755f3b6497eafbe1d6ec85.zip | |
convert a few do_div users
This converts a few users of do_div to div_[su]64 and this demonstrates nicely
how it can reduce some expressions to one-liners.
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/time/ntp.c')
| -rw-r--r-- | kernel/time/ntp.c | 25 |
1 files changed, 6 insertions, 19 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 5fd9b9469770..a4492f3d64db 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -15,7 +15,7 @@ #include <linux/jiffies.h> #include <linux/hrtimer.h> #include <linux/capability.h> -#include <asm/div64.h> +#include <linux/math64.h> #include <asm/timex.h> /* @@ -53,10 +53,8 @@ static void ntp_update_frequency(void) tick_length_base = second_length; - do_div(second_length, HZ); - tick_nsec = second_length >> TICK_LENGTH_SHIFT; - - do_div(tick_length_base, NTP_INTERVAL_FREQ); + tick_nsec = div_u64(second_length, HZ) >> TICK_LENGTH_SHIFT; + tick_length_base = div_u64(tick_length_base, NTP_INTERVAL_FREQ); } /** @@ -237,7 +235,7 @@ static inline void notify_cmos_timer(void) { } int do_adjtimex(struct timex *txc) { long mtemp, save_adjust, rem; - s64 freq_adj, temp64; + s64 freq_adj; int result; /* In order to modify anything, you gotta be super-user! */ @@ -342,19 +340,8 @@ int do_adjtimex(struct timex *txc) freq_adj = time_offset * mtemp; freq_adj = shift_right(freq_adj, time_constant * 2 + (SHIFT_PLL + 2) * 2 - SHIFT_NSEC); - if (mtemp >= MINSEC && (time_status & STA_FLL || mtemp > MAXSEC)) { - u64 utemp64; - temp64 = time_offset << (SHIFT_NSEC - SHIFT_FLL); - if (time_offset < 0) { - utemp64 = -temp64; - do_div(utemp64, mtemp); - freq_adj -= utemp64; - } else { - utemp64 = temp64; - do_div(utemp64, mtemp); - freq_adj += utemp64; - } - } + if (mtemp >= MINSEC && (time_status & STA_FLL || mtemp > MAXSEC)) + freq_adj += div_s64(time_offset << (SHIFT_NSEC - SHIFT_FLL), mtemp); freq_adj += time_freq; freq_adj = min(freq_adj, (s64)MAXFREQ_NSEC); time_freq = max(freq_adj, (s64)-MAXFREQ_NSEC); |