Why do we have to specify hrtimer_mode twice using hrtimers

[Linux Weekend Learning]

Hi All,

Why do we need to specify hrtimer_mode twice while using hrtimers.

   1.

   Timer Initialization:

   void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, enum
   hrtimer_mode mode);
   2.

   Starting a timer:

   void hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum
   hrtimer_mode mode);

What will happen if i specify different modes in both functions.
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