[PATCH] mm/huge_memory: Initialise the tags of the huge zero folio

[Beleswar Prasad Padhi]

On 11/3/2025 9:29 PM, Catalin Marinas wrote:
> On Mon, Nov 03, 2025 at 03:41:03PM +0100, David Hildenbrand (Red Hat) wrote:
>>> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
>>> index d816ff44faff..125dfa6c613b 100644
>>> --- a/arch/arm64/mm/fault.c
>>> +++ b/arch/arm64/mm/fault.c
>>> @@ -969,6 +969,16 @@ struct folio *vma_alloc_zeroed_movable_folio(struct vm_area_struct *vma,
>>>    void tag_clear_highpage(struct page *page)
>>>    {
>>> +	/*
>>> +	 * Check if MTE is supported and fall back to clear_highpage().
>>> +	 * get_huge_zero_folio() unconditionally passes __GFP_ZEROTAGS and
>>> +	 * post_alloc_hook() will invoke tag_clear_highpage().
>>> +	 */
>>> +	if (!system_supports_mte()) {
>>> +		clear_highpage(page);
>>> +		return;
>>> +	}
>> LGTM!
> I tested it with and without MTE and it works fine.


I tested the above patch on ARM64 based TI J7200 EVM board.
Boots fine. Feel free to use my T/B:

Tested-by: Beleswar Padhi <b-padhi at ti.com>

Thanks,
Beleswar

>
> Andrew, would you like a separate patch or are you ok with folding this
> into the previous patch?
>
> Thanks.
>