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authorjohn stultz <johnstul@us.ibm.com>2009-09-16 08:17:19 +0400
committerMike Frysinger <vapier@gentoo.org>2009-10-07 12:36:20 +0400
commit10f03f1a249df01ec760e3494298510efad3271f (patch)
treec2558955c9b51834648887828d9ecfe0f3a74527
parent0eca52a92735f43462165efe00a7e394345fb38e (diff)
downloadlinux-10f03f1a249df01ec760e3494298510efad3271f.tar.xz
Blackfin: convert to use arch_gettimeoffset()
Convert Blackfin 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 My cross-compiler is now out of date (gcc4.2) so I wasn't able to check if it compiled.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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
-rw-r--r--arch/blackfin/Kconfig10
-rw-r--r--arch/blackfin/kernel/time.c63
2 files changed, 8 insertions, 65 deletions
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 9a01d445eca8..e51988237d3b 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -229,7 +229,7 @@ endchoice
config SMP
depends on BF561
- select GENERIC_TIME
+ select GENERIC_CLOCKEVENTS
bool "Symmetric multi-processing support"
---help---
This enables support for systems with more than one CPU,
@@ -613,12 +613,10 @@ comment "Kernel Timer/Scheduler"
source kernel/Kconfig.hz
config GENERIC_TIME
- bool "Generic time"
- default y
+ def_bool y
config GENERIC_CLOCKEVENTS
bool "Generic clock events"
- depends on GENERIC_TIME
default y
choice
@@ -653,6 +651,10 @@ config GPTMR0_CLOCKSOURCE
depends on GENERIC_CLOCKEVENTS
depends on !TICKSOURCE_GPTMR0
+config ARCH_USES_GETTIMEOFFSET
+ depends on !GENERIC_CLOCKEVENTS
+ def_bool y
+
source kernel/time/Kconfig
comment "Misc"
diff --git a/arch/blackfin/kernel/time.c b/arch/blackfin/kernel/time.c
index adb54aa7d7c8..e5069fe6861e 100644
--- a/arch/blackfin/kernel/time.c
+++ b/arch/blackfin/kernel/time.c
@@ -81,11 +81,11 @@ time_sched_init(irqreturn_t(*timer_routine) (int, void *))
#endif
}
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
/*
* Should return useconds since last timer tick
*/
-#ifndef CONFIG_GENERIC_TIME
-static unsigned long gettimeoffset(void)
+u32 arch_gettimeoffset(void)
{
unsigned long offset;
unsigned long clocks_per_jiffy;
@@ -184,65 +184,6 @@ void __init time_init(void)
time_sched_init(timer_interrupt);
}
-#ifndef CONFIG_GENERIC_TIME
-void do_gettimeofday(struct timeval *tv)
-{
- unsigned long flags;
- unsigned long seq;
- unsigned long usec, sec;
-
- do {
- seq = read_seqbegin_irqsave(&xtime_lock, flags);
- usec = gettimeoffset();
- sec = xtime.tv_sec;
- usec += (xtime.tv_nsec / NSEC_PER_USEC);
- }
- while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
- while (usec >= USEC_PER_SEC) {
- usec -= USEC_PER_SEC;
- 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_usec
- * 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 -= (gettimeoffset() * NSEC_PER_USEC);
-
- 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;
-}
-EXPORT_SYMBOL(do_settimeofday);
-#endif /* !CONFIG_GENERIC_TIME */
-
/*
* Scheduler clock - returns current time in nanosec units.
*/