From f8bd2258e2d520dff28c855658bd24bdafb5102d Mon Sep 17 00:00:00 2001 From: Roman Zippel Date: Thu, 1 May 2008 04:34:31 -0700 Subject: remove div_long_long_rem x86 is the only arch right now, which provides an optimized for div_long_long_rem and it has the downside that one has to be very careful that the divide doesn't overflow. The API is a little akward, as the arguments for the unsigned divide are signed. The signed version also doesn't handle a negative divisor and produces worse code on 64bit archs. There is little incentive to keep this API alive, so this converts the few users to the new API. Signed-off-by: Roman Zippel Cc: Ralf Baechle Cc: Ingo Molnar Cc: Thomas Gleixner Cc: john stultz Cc: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/posix-cpu-timers.c | 11 +++++------ kernel/time.c | 25 +++++++++++++++---------- kernel/time/ntp.c | 6 ++---- 3 files changed, 22 insertions(+), 20 deletions(-) (limited to 'kernel') diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c index ae5c6c1..f1525ad 100644 --- a/kernel/posix-cpu-timers.c +++ b/kernel/posix-cpu-timers.c @@ -4,8 +4,9 @@ #include #include -#include #include +#include +#include static int check_clock(const clockid_t which_clock) { @@ -47,12 +48,10 @@ static void sample_to_timespec(const clockid_t which_clock, union cpu_time_count cpu, struct timespec *tp) { - if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { - tp->tv_sec = div_long_long_rem(cpu.sched, - NSEC_PER_SEC, &tp->tv_nsec); - } else { + if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) + *tp = ns_to_timespec(cpu.sched); + else cputime_to_timespec(cpu.cpu, tp); - } } static inline int cpu_time_before(const clockid_t which_clock, diff --git a/kernel/time.c b/kernel/time.c index 343e2515..cbe0d5a 100644 --- a/kernel/time.c +++ b/kernel/time.c @@ -392,13 +392,17 @@ EXPORT_SYMBOL(set_normalized_timespec); struct timespec ns_to_timespec(const s64 nsec) { struct timespec ts; + s32 rem; if (!nsec) return (struct timespec) {0, 0}; - ts.tv_sec = div_long_long_rem_signed(nsec, NSEC_PER_SEC, &ts.tv_nsec); - if (unlikely(nsec < 0)) - set_normalized_timespec(&ts, ts.tv_sec, ts.tv_nsec); + ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem); + if (unlikely(rem < 0)) { + ts.tv_sec--; + rem += NSEC_PER_SEC; + } + ts.tv_nsec = rem; return ts; } @@ -528,8 +532,10 @@ jiffies_to_timespec(const unsigned long jiffies, struct timespec *value) * Convert jiffies to nanoseconds and separate with * one divide. */ - u64 nsec = (u64)jiffies * TICK_NSEC; - value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &value->tv_nsec); + u32 rem; + value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC, + NSEC_PER_SEC, &rem); + value->tv_nsec = rem; } EXPORT_SYMBOL(jiffies_to_timespec); @@ -567,12 +573,11 @@ void jiffies_to_timeval(const unsigned long jiffies, struct timeval *value) * Convert jiffies to nanoseconds and separate with * one divide. */ - u64 nsec = (u64)jiffies * TICK_NSEC; - long tv_usec; + u32 rem; - value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &tv_usec); - tv_usec /= NSEC_PER_USEC; - value->tv_usec = tv_usec; + value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC, + NSEC_PER_SEC, &rem); + value->tv_usec = rem / NSEC_PER_USEC; } EXPORT_SYMBOL(jiffies_to_timeval); diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index a4492f3..dbd6f89 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -234,7 +234,7 @@ static inline void notify_cmos_timer(void) { } */ int do_adjtimex(struct timex *txc) { - long mtemp, save_adjust, rem; + long mtemp, save_adjust; s64 freq_adj; int result; @@ -345,9 +345,7 @@ int do_adjtimex(struct timex *txc) freq_adj += time_freq; freq_adj = min(freq_adj, (s64)MAXFREQ_NSEC); time_freq = max(freq_adj, (s64)-MAXFREQ_NSEC); - time_offset = div_long_long_rem_signed(time_offset, - NTP_INTERVAL_FREQ, - &rem); + time_offset = div_s64(time_offset, NTP_INTERVAL_FREQ); time_offset <<= SHIFT_UPDATE; } /* STA_PLL */ } /* txc->modes & ADJ_OFFSET */ -- cgit v1.1