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authorRoman Zippel <zippel@linux-m68k.org>2008-05-01 04:34:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-01 08:03:58 -0700
commit71abb3af62dfa52930755f3b6497eafbe1d6ec85 (patch)
tree8e37f74017b800127538f6620820ea90b53169b5 /kernel/time/ntp.c
parent2418f4f28f8467b92a6177af32d05737ebf6206c (diff)
downloadop-kernel-dev-71abb3af62dfa52930755f3b6497eafbe1d6ec85.zip
op-kernel-dev-71abb3af62dfa52930755f3b6497eafbe1d6ec85.tar.gz
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.c25
1 files changed, 6 insertions, 19 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 5fd9b94..a4492f3 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);
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