Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b7ec15bd004f4524bf091f851348da2ccb519e4f
Commit: b7ec15bd004f4524bf091f851348da2ccb519e4f
Parent: 83ff7df5f1c1c44efd84d7341211aa0138fd9504
Author: Jeff Dike <[EMAIL PROTECTED]>
AuthorDate: Sun May 6 14:51:51 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon May 7 12:13:04 2007 -0700
uml: virtualized time fix
With the current timekeeping, !CONFIG_UML_REAL_TIME_CLOCK has
inconsistent behavior. Previously, gettimeofday could be (and was)
isolated from the clock ticking. Now, it's not, so when
CONFIG_UML_REAL_TIME_CLOCK is disabled, gettimeofday must progress in
lockstep with the clock, making it fully virtual.
Signed-off-by: Jeff Dike <[EMAIL PROTECTED]>
Cc: Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
arch/um/kernel/time.c | 14 ++++++++++++--
1 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index 9fd80ee..cd7349d 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -34,8 +34,8 @@ unsigned long long sched_clock(void)
return (unsigned long long)jiffies_64 * (1000000000 / HZ);
}
-static unsigned long long prev_nsecs[NR_CPUS];
#ifdef CONFIG_UML_REAL_TIME_CLOCK
+static unsigned long long prev_nsecs[NR_CPUS];
static long long delta[NR_CPUS]; /* Deviation per interval */
#endif
@@ -94,7 +94,12 @@ irqreturn_t um_timer(int irq, void *dev)
do_timer(1);
+#ifdef CONFIG_UML_REAL_TIME_CLOCK
nsecs = get_time();
+#else
+ nsecs = (unsigned long long) xtime.tv_sec * BILLION + xtime.tv_nsec +
+ BILLION / HZ;
+#endif
xtime.tv_sec = nsecs / NSEC_PER_SEC;
xtime.tv_nsec = nsecs - xtime.tv_sec * NSEC_PER_SEC;
@@ -127,13 +132,18 @@ void time_init(void)
nsecs = os_nsecs();
set_normalized_timespec(&wall_to_monotonic, -nsecs / BILLION,
-nsecs % BILLION);
+ set_normalized_timespec(&xtime, nsecs / BILLION, nsecs % BILLION);
late_time_init = register_timer;
}
void do_gettimeofday(struct timeval *tv)
{
+#ifdef CONFIG_UML_REAL_TIME_CLOCK
unsigned long long nsecs = get_time();
-
+#else
+ unsigned long long nsecs = (unsigned long long) xtime.tv_sec * BILLION +
+ xtime.tv_nsec;
+#endif
tv->tv_sec = nsecs / NSEC_PER_SEC;
/* Careful about calculations here - this was originally done as
* (nsecs - tv->tv_sec * NSEC_PER_SEC) / NSEC_PER_USEC
-
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