santhosh [off-list ref] writes:

quoted

Michael Ellerman [off-list ref] writes:

quoted

On Fri, 2016-19-02 at 05:38:47 UTC, Rashmica Gupta wrote:

quoted

Currently on PPC64 changing kernel pagesize from 4K to 64K leaves
FORCE_MAX_ZONEORDER set to 13 - which produces a compile error.

...

quoted

So, update the range of FORCE_MAX_ZONEORDER from 9-64 to 8-9 for 64K pages
and from 13-64 to 9-13 for 4K pages.

https://git.kernel.org/powerpc/c/a7ee539584acf4a565b7439cea

HPAGE_PMD_ORDER is not something we should check w.r.t 4k linux page
size. We do have the below constraint w.r.t hugetlb pages

static inline bool hstate_is_gigantic(struct hstate *h)
{
	return huge_page_order(h) >= MAX_ORDER;
}

That require MAX_ORDER to be greater than 12.

So have you tried that fix?

cheers