Re: [PATCH] Kill div64.h dupes, parenthesize do_div() macro params

[Andrew Morton]

Bernardo Innocenti <[e-mail]> wrote:
>
>  By the way, what do you think about getting rid of the do_div() macro
>  altogether?

I think we leave it the way it is because 64-bit divides are slow.

It is very easy to go accidentally adding 64-bit divides.  Say, by changing
the disk indexing to use 64-bit sector numbers as we did earlier in 2.5.

By requiring an explicit do_div we are made aware of all those 64-bit
divides and are made to think about them.

Why 64-bit divides in particular were victimised in this manner is a matter
for speculation ;)