diff options
| author | john stultz <johnstul@us.ibm.com> | 2011-05-04 18:16:50 -0700 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2012-03-14 10:57:59 -0400 |
| commit | 54d0eb4d980994c0743e9a9174ed2697da97f191 (patch) | |
| tree | b48773659f0a51c2350f9d970edc5bc981d948e9 | |
| parent | f34200edd4a90442361afa1a89d9d0e24875e1a1 (diff) | |
clocksource: Install completely before selecting
commit e05b2efb82596905ebfe88e8612ee81dec9b6592 upstream.
Christian Hoffmann reported that the command line clocksource override
with acpi_pm timer fails:
Kernel command line: <SNIP> clocksource=acpi_pm
hpet clockevent registered
Switching to clocksource hpet
Override clocksource acpi_pm is not HRT compatible.
Cannot switch while in HRT/NOHZ mode.
The watchdog code is what enables CLOCK_SOURCE_VALID_FOR_HRES, but we
actually end up selecting the clocksource before we enqueue it into
the watchdog list, so that's why we see the warning and fail to switch
to acpi_pm timer as requested. That's particularly bad when we want to
debug timekeeping related problems in early boot.
Put the selection call last.
[PG: 34 doesn't have __clocksource_register_scale, so drop that 1/2]
Reported-by: Christian Hoffmann <email@christianhoffmann.info>
Signed-off-by: John Stultz <johnstul@us.ibm.com>
Link: http://lkml.kernel.org/r/%3C1304558210.2943.24.camel%40work-vm%3E
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
| -rw-r--r-- | kernel/time/clocksource.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 1f5dde637457..db24c5ce2cab 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -638,8 +638,8 @@ int clocksource_register(struct clocksource *cs) mutex_lock(&clocksource_mutex); clocksource_enqueue(cs); - clocksource_select(); clocksource_enqueue_watchdog(cs); + clocksource_select(); mutex_unlock(&clocksource_mutex); return 0; } |