Re: [RFC] HOWTO do Linux kernel development - take 3

[Randy.Dunlap]

On Wed, 23 Nov 2005 22:16:40 -0800 James G. Sack (jim) wrote:

> Pardon the technical question, but..
> 
> I wonder if you could either elaborate or give a reference to what is  
> meant by
> 
>    "Arbitrary long long divisions .. not allowed"

(if not already answered)

short answer:  see include/asm-generic/div64.h


longer answer:

Not supported:

long long numerator, divisor, dividend;
/* init. numerator & divisor */
dividend = numerator / divisor;

Is supported:

uin64_t numerator, dividend;
uint32_t divisor, remainder;
/* init. numerator & divisor */
remainder = do_div(&numerator, divisor);


---
~Randy
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