/**
* struct tk_read_base - base structure for timekeeping readout
* @clock: Current clocksource used for timekeeping.
- * @read: Read function of @clock
* @mask: Bitmask for two's complement subtraction of non 64bit clocks
* @cycle_last: @clock cycle value at last update
* @mult: (NTP adjusted) multiplier for scaled math conversion
* @shift: Shift value for scaled math conversion
* @xtime_nsec: Shifted (fractional) nano seconds offset for readout
* @base: ktime_t (nanoseconds) base time for readout
+ * @base_real: Nanoseconds base value for clock REALTIME readout
*
* This struct has size 56 byte on 64 bit. Together with a seqcount it
* occupies a single 64byte cache line.
*
* The struct is separate from struct timekeeper as it is also used
* for a fast NMI safe accessors.
+ *
+ * @base_real is for the fast NMI safe accessor to allow reading clock
+ * realtime from any context.
*/
struct tk_read_base {
struct clocksource *clock;
u32 shift;
u64 xtime_nsec;
ktime_t base;
+ u64 base_real;
};
/**