On Fri, Jun 17, 2022 at 4:58 PM Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote:
>
> Add sparse memory vmemmap support for LoongArch. SPARSEMEM_VMEMMAP
> uses a virtually mapped memmap to optimise pfn_to_page and page_to_pfn
> operations. This is the most efficient option when sufficient kernel
> resources are available.
I have not looked at this in detail, but from a high-level perspective, it
seems very similar to the corresponding code in arch/arm64 and arch/x86.
Can you try to merge the three copies into a generic helper and add that
to mm/sparse-vmemmap.c? If this does not work, can you describe in the
changelog text why these have to be architecture specific?
Arnd
