Re: [PATCH] tcp_lp: use 64-bit arithmetic instead of 32-bit

[Alan Cox]

On Wed, 31 Jan 2018 18:24:07 -0600
"Gustavo A. R. Silva" <gustavo@xxxxxxxxxxxxxx> wrote:

> Cast to s64 some variables and a macro in order to give the
> compiler complete information about the proper arithmetic to
> use. Notice that these elements are used in contexts that
> expect expressions of type s64 (64 bits, signed).
> 
> Currently such expression are being evaluated using 32-bit
> arithmetic.

The question you need to ask is 'can it overflow 32bit maths', otherwise
you are potentially making the system do extra work for no reason.

Alan