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clocksource: Make delta calculation a function

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We want to move the TSC sanity check into core code to make NMI safe
accessors to clock monotonic[_raw] possible. For this we need to
sanity check the delta calculation. Create a helper function and
convert all sites to use it.

[ Build fix from jstultz ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Thomas Gleixner
2014-07-16 21:05:10 +00:00
committed by John Stultz
parent 6438e0ddc8
commit 3a97837784
3 changed files with 27 additions and 17 deletions
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6
kernel/time/timekeeping_internal.h
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@@ -3,6 +3,7 @@
/*
* timekeeping debug functions
*/
#include <linux/clocksource.h>
#include <linux/time.h>
#ifdef CONFIG_DEBUG_FS
@@ -11,4 +12,9 @@ extern void tk_debug_account_sleep_time(struct timespec64 *t);
#define tk_debug_account_sleep_time(x)
#endif
static inline cycle_t clocksource_delta(cycle_t now, cycle_t last, cycle_t mask)
{
return (now - last) & mask;
}
#endif /* _TIMEKEEPING_INTERNAL_H */