division and cpu usage

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Hello.

I'm new to kernel development and have some questions.

1. Apperently kernel doesn't support operations with floating-point
types. How can I then divide a number 265 with the number 7 if I can
divide only by 2 with right-shifting?

2. I'm trying to get the percentage of CPU used for a certain
task_struct and figured the following formula:

(task->utime + task->stime) / jiffies

Before calculating I convert all the variables to jiffies. Is this correct?

Please help.

Greets,
Luka

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