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Commit e97126cd authored by Russell King's avatar Russell King Committed by Russell King
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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: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 6020dff0

arch/arm/kernel/time.c

+11 −0
Original line number Diff line number Diff line
@@ -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;



/*