Re: [PATCH v6 5/8] LoongArch: Allow memblock arrays to resize

[Huacai Chen]

Hi, Mike,

On Thu, Nov 5, 2026 at 8:57 PM Mike Rapoport <rppt@xxxxxxxxxx> wrote:
>
> On Fri, Oct 30, 2026 at 02:29:52AM +0900, George Guo wrote:
> > From: George Guo <guodongtai@xxxxxxxxxx>
> >
> > LoongArch never calls memblock_allow_resize(), so the reserved region
> > array cannot grow beyond INIT_MEMBLOCK_RESERVED_REGIONS entries
> > (INIT_MEMBLOCK_REGIONS + NR_CPUS).
>
> This might be something to fix independent of KHO.
>
> Huacai,
>
> What's the reason LoongArch never enables memblock resizing and why it
> defines INIT_MEMBLOCK_RESERVED_REGIONS to include NR_CPUS?
At first we didn't define INIT_MEMBLOCK_RESERVED_REGIONS, then we got
boot failures on a 128-cores machine, so define it, and the value is
similar to arm64.

The reason LoongArch never enables memblock resizing is because the mm
code is derived from MIPS, and MIPS never enables it.

Huacai

>
> --
> Sincerely yours,
> Mike.