hrtimer: Reduce trace noise in hrtimer_start()

hrtimer: Reduce trace noise in hrtimer_start()

hrtimer_start() when invoked with an already armed timer traces like:

 <comm>-..   [032] d.h2. 5.002263: hrtimer_cancel: hrtimer= ....
 <comm>-..   [032] d.h1. 5.002263: hrtimer_start: hrtimer= ....

Which is incorrect as the timer doesn't get canceled. Just the expiry time
changes. The internal dequeue operation which is required for that is not
really interesting for trace analysis. But it makes it tedious to keep real
cancellations and the above case apart.

Remove the cancel tracing in hrtimer_start() and add a 'was_armed'
indicator to the hrtimer start tracepoint, which clearly indicates what the
state of the hrtimer is when hrtimer_start() is invoked:

<comm>-..   [032] d.h1. 6.200103: hrtimer_start: hrtimer= .... was_armed=0
 <comm>-..   [032] d.h1. 6.200558: hrtimer_start: hrtimer= .... was_armed=1

Fixes: c6a2a1770245 ("hrtimer: Add tracepoint for hrtimers")
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163430.208491877@kernel.org