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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-08-14 17:47:21 +0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-08-15 12:55:46 +0400 |
| commit | f1b82746c1e93daf24e1ab9bfbd39bcdb2e7018b (patch) | |
| tree | 1403e3662dd3b32cb8b17218bfdd9a640061f654 /include/linux/clocksource.h | |
| parent | 1be396794897f80bfc8774719ba60309a9e3d374 (diff) | |
| download | linux-f1b82746c1e93daf24e1ab9bfbd39bcdb2e7018b.tar.xz | |
clocksource: Cleanup clocksource selection
If a non high-resolution clocksource is first set as override clock
and then registered it becomes active even if the system is in one-shot
mode. Move the override check from sysfs_override_clocksource to the
clocksource selection. That fixes the bug and simplifies the code. The
check in clocksource_register for double registration of the same
clocksource is removed without replacement.
To find the initial clocksource a new weak function in jiffies.c is
defined that returns the jiffies clocksource. The architecture code
can then override the weak function with a more suitable clocksource,
e.g. the TOD clock on s390.
[ tglx: Folded in a fix from John Stultz ]
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: John Stultz <johnstul@us.ibm.com>
Cc: Daniel Walker <dwalker@fifo99.com>
LKML-Reference: <20090814134808.388024160@de.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/clocksource.h')
| -rw-r--r-- | include/linux/clocksource.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index a1ef46f61c81..f263b3abf46e 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -14,6 +14,7 @@ #include <linux/list.h> #include <linux/cache.h> #include <linux/timer.h> +#include <linux/init.h> #include <asm/div64.h> #include <asm/io.h> @@ -322,6 +323,7 @@ extern void clocksource_touch_watchdog(void); extern struct clocksource* clocksource_get_next(void); extern void clocksource_change_rating(struct clocksource *cs, int rating); extern void clocksource_resume(void); +extern struct clocksource * __init __weak clocksource_default_clock(void); #ifdef CONFIG_GENERIC_TIME_VSYSCALL extern void update_vsyscall(struct timespec *ts, struct clocksource *c); |