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[ARM] Provide basic printk_clock() implementation 

Current sched_clock() implementations on ARM cause unbootable kernels
with PRINTK_TIME support enabled.  To avoid this, provide a basic
printk_clock() implementation which avoids sched_clock() being called
before the page tables have been set up.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-01-08 19:49:12 +00:00 committed by Russell King
parent 6020dff092
commit e97126cd90
1 changed files with 11 additions and 0 deletions
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11
arch/arm/kernel/time.c
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@ -87,6 +87,17 @@ unsigned long long __attribute__((weak)) sched_clock(void)
return (unsigned long long)jiffies * (1000000000 / HZ);
}
/*
* An implementation of printk_clock() independent from
* sched_clock(). This avoids non-bootable kernels when
* printk_clock is enabled.
*/
unsigned long long printk_clock(void)
{
return (unsigned long long)(jiffies - INITIAL_JIFFIES) *
(1000000000 / HZ);
}
static unsigned long next_rtc_update;
/*