Answer / rajath n r

Softirq is a type of bottom half. Softirqs are rarely used,
Softirqs are statically allocated at compile-time. Unlike
tasklets, you cannot dynamically register and destroy
softirqs. They are required only for very high-frequency and
high threaded uses.

there can be a maximum of 32 registered softirqs. Note that
this cap is fixedthe maximum number of registered softirqs
cannot be dynamically changed. In the current kernel,
however, only 6 of the 32 entries are used

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