Comment of function tasklet_hrtimer_init：
Init a tasklet/hrtimer combo for softirq callbacks
There are few routines used in kernel about tasklet_hrtimer_init.
Can tasklet_hrtimer_init be used in the callback function of hardware interrupt?
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Of course not. It starts a tasklet, including setting up mempools and using spinlocks. Why would you do that in an interrupt routine? An interrupt routine should do the minimum needed to service the interrupt. – stark Dec 29 '21 at 15:29
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Will mempools and spinlocks affect tasklet_hrtimer_init? – Carlos Dec 31 '21 at 03:19
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Why do you want to do this? I would highly recommend doing the initialization before setting up the IRQ handler. In the IRQ handler routine, you could start or restart an already initialized hrtimer, or try to cancel a started hrtimer. – Ian Abbott Jan 05 '22 at 16:52