linux - what does the flag IRQF_SAMPLE_RANDOM specify while registering interrupt handlers? -


in request_irq() register interrupt handlers, why use flag irqf_sample_random , entropy pool?

the entropy pool collects randomness /dev/random , /dev/urandom devices.

in outdated kernels, have used irqf_sample_random tell kernel times @ device generates interrupts unpredictable.

since kernel version 3.6, kernel handles interrupt randomness automatically, , flag no longer exists.


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