On Mon, 20 Nov 2023 at 05:31, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
>
> NR_ORDERS defines the number of page orders supported by the page
> allocator, ranging from 0 to MAX_ORDER, MAX_ORDER + 1 in total.
>
> NR_ORDERS assists in defining arrays of page orders and allows for more
> natural iteration over them.
Well, the thing is, I really think we need to rename or remove
"MAX_ORDER" entirely.
Because as-is, that #define now has completely different meaning than
it used to have for 24 years. Which is not only confusing to people
who might just remember the old semantics, it's a problem for
backporting (and for merging stuff, but that is a fairly temporary
pain and _maybe_ this one-time device mapper thing was the only time
it will ever happen)
Linus
