Commit e97126cd authored by Russell King's avatar Russell King Committed by Russell King

[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
...@@ -87,6 +87,17 @@ unsigned long long __attribute__((weak)) sched_clock(void) ...@@ -87,6 +87,17 @@ unsigned long long __attribute__((weak)) sched_clock(void)
return (unsigned long long)jiffies * (1000000000 / HZ); 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; static unsigned long next_rtc_update;
/* /*
......
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