lkml.org 
[lkml]   [2006]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[RFC][PATCH 1/6] x86_64: Enable arch-generic vsyscall support.
Provides generic infrastructure for vsyscall-gtod.

Signed-off-by: John Stultz <johnstul@us.ibm.com>

include/linux/clocksource.h | 2 ++
kernel/timer.c | 7 +++++++
2 files changed, 9 insertions(+)
linux-2.6.18-rc4_timeofday-vsyscall-support_C5.patch
============================================
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index d852024..f554273 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -46,6 +46,7 @@ typedef u64 cycle_t;
* @shift: cycle to nanosecond divisor (power of two)
* @update_callback: called when safe to alter clocksource values
* @is_continuous: defines if clocksource is free-running.
+ * @vread: vsyscall based read
* @cycle_interval: Used internally by timekeeping core, please ignore.
* @xtime_interval: Used internally by timekeeping core, please ignore.
*/
@@ -59,6 +60,7 @@ struct clocksource {
u32 shift;
int (*update_callback)(void);
int is_continuous;
+ cycle_t (*vread)(void);

/* timekeeping specific data, ignore */
cycle_t cycle_last, cycle_interval;
diff --git a/kernel/timer.c b/kernel/timer.c
index b650f04..08b4a02 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1023,6 +1023,12 @@ static int __init timekeeping_init_devic

device_initcall(timekeeping_init_device);

+#ifdef CONFIG_GENERIC_TIME_VSYSCALL
+extern void update_vsyscall(struct timespec* ts, struct clocksource* c);
+#else
+#define update_vsyscall(now, c)
+#endif
+
/*
* If the error is already larger, we look ahead even further
* to compensate for late or lost adjustments.
@@ -1165,6 +1171,7 @@ static void update_wall_time(void)
clock->xtime_nsec = 0;
clocksource_calculate_interval(clock, tick_nsec);
}
+ update_vsyscall(&xtime, clock);
}

/*
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2006-08-09 04:21    [from the cache]
©2003-2011 Jasper Spaans