# Re: \[PATCH\] arm64: Define only {pud/pmd}\_{set/clear}\_huge when usefull

- From: Christophe Leroy \<hidden\>
- Date: 2021-05-15 06:28:37 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/05/1378377
- Thread: https://ratatoskr.run/linux-arch/2021/05/1378227/t.md

```text


Le 14/05/2021 à 23:42, Andrew Morton a écrit :
> On Fri, 14 May 2021 11:08:53 +0000 (UTC) Christophe Leroy [ref] wrote:
>
>> When PUD and/or PMD are folded, those functions are useless
>> and we now have a stub in linux/pgtable.h
>
> OK, help me out here please.  What patch does this fix?
>

Both this one and the x86 one from the day before fix 1cff41494b15cd82c1ec418bb5c ("mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge")

I think both the x86 fix and the arm64 fix should be squashed into that patch at the end.

I checked, the only other architecture involving pud_set_huge() and friends is powerpc, and powerpc doesn't have this problem as it only defined those for book3s/64 platforms which have 4 level page tables by definition.

Thanks
Christophe

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