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authorjohn stultz <johnstul@us.ibm.com>2009-09-21 17:04:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:43 -0700
commit4ad4c76b7afb71774b846b322ad2ae42f814331a (patch)
treeeae834caeb70f70c1112113628cf6f94a0bdfd14
parentef187fd799c50e15dbb56a0286c81bf467bd0201 (diff)
m68k: convert to use arch_gettimeoffset()
Convert m68k to use GENERIC_TIME via the arch_getoffset() infrastructure, reducing the amount of arch specific code we need to maintain. I've taken my best swing at converting this, but I'm not 100% confident I got it right. My cross-compiler is now out of date (gcc4.2) so I wasn't able to check if it compiled. Any assistance from arch maintainers or testers to get this merged would be great. Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/m68k/Kconfig6
-rw-r--r--arch/m68k/kernel/time.c70
2 files changed, 8 insertions, 68 deletions
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index fb87c08c6b5..29dd8489ffe 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -58,6 +58,12 @@ config HZ
int
default 100
+config GENERIC_TIME
+ def_bool y
+
+config ARCH_USES_GETTIMEOFFSET
+ def_bool y
+
mainmenu "Linux/68k Kernel Configuration"
source "init/Kconfig"
diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c
index 54d980795fc..17dc2a31a7c 100644
--- a/arch/m68k/kernel/time.c
+++ b/arch/m68k/kernel/time.c
@@ -91,77 +91,11 @@ void __init time_init(void)
mach_sched_init(timer_interrupt);
}
-/*
- * This version of gettimeofday has near microsecond resolution.
- */
-void do_gettimeofday(struct timeval *tv)
+u32 arch_gettimeoffset(void)
{
- unsigned long flags;
- unsigned long seq;
- unsigned long usec, sec;
- unsigned long max_ntp_tick = tick_usec - tickadj;
-
- do {
- seq = read_seqbegin_irqsave(&xtime_lock, flags);
-
- usec = mach_gettimeoffset();
-
- /*
- * If time_adjust is negative then NTP is slowing the clock
- * so make sure not to go into next possible interval.
- * Better to lose some accuracy than have time go backwards..
- */
- if (unlikely(time_adjust < 0))
- usec = min(usec, max_ntp_tick);
-
- sec = xtime.tv_sec;
- usec += xtime.tv_nsec/1000;
- } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
-
- while (usec >= 1000000) {
- usec -= 1000000;
- sec++;
- }
-
- tv->tv_sec = sec;
- tv->tv_usec = usec;
-}
-
-EXPORT_SYMBOL(do_gettimeofday);
-
-int do_settimeofday(struct timespec *tv)
-{
- time_t wtm_sec, sec = tv->tv_sec;
- long wtm_nsec, nsec = tv->tv_nsec;
-
- if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
- return -EINVAL;
-
- write_seqlock_irq(&xtime_lock);
- /* This is revolting. We need to set the xtime.tv_nsec
- * correctly. However, the value in this location is
- * is value at the last tick.
- * Discover what correction gettimeofday
- * would have done, and then undo it!
- */
- nsec -= 1000 * mach_gettimeoffset();
-
- wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
- wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
-
- set_normalized_timespec(&xtime, sec, nsec);
- set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
-
- ntp_clear();
- write_sequnlock_irq(&xtime_lock);
- clock_was_set();
- return 0;
+ return mach_gettimeoffset() * 1000;
}
-EXPORT_SYMBOL(do_settimeofday);
-
-
static int __init rtc_init(void)
{
struct platform_device *pdev;