[v4 PATCH] arm64: mm: show direct mapping use in /proc/meminfo

[Christoph Lameter (Ampere)]

On Fri, 21 Nov 2025, Yang Shi wrote:

> Although ptdump also can tell the direct map use, but it needs to dump
> the whole kernel page table. It is costly and overkilling. It is also
> in debugfs which may not be enabled by all distros. So showing direct
> map use in /proc/meminfo seems more convenient and has less overhead.

Also done the same way on x86, parisc, powerpc and s390.

Reviewed-by: Christoph Lameter (Ampere) <cl at gentwo.org>