Prompt the account Scheduling O(1)

[Meyer Lansky]

 Hello!  E xcuse me for my english.
I study source code scheduler O(1)  code :

if (hardirq_count())
                per_cpu(cpu_hardirq_time, cpu) +=delta;
else if (in_serving_softirq() && !(curr->flags & PF_KSOFTIRQD))
                per_cpu(cpu_softirq_time, cpu) +=delta;

question:  tell me what 's going on here ?

I have this code in paper form ,  so I can not give you a link to the code .
If there is a need to rewrite your page

please help !
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