santhosh <santh...@linux.vnet.ibm.com> writes:

>> Michael Ellerman <m...@ellerman.id.au> writes:
>>
>>> On Fri, 2016-19-02 at 05:38:47 UTC, Rashmica Gupta wrote:
>>>> Currently on PPC64 changing kernel pagesize from 4K to 64K leaves
>>>> FORCE_MAX_ZONEORDER set to 13 - which produces a compile error.
>>>>
>>> ...
>>>> 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

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