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

[Andrew Morton]

On Mon, 3 Nov 2025 15:59:39 +0000 Catalin Marinas <catalin.marinas at arm.com> wrote:

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

I added it as a -fix patch thanks.

And I added a Signed-off-by-you-by-me ;)