Re: "alloc_tag was not set" when running mm/ksft_hmm.sh

[Zenghui Yu]

On 2026/5/12 0:38, Zenghui Yu wrote:
> Hi David,
> 
> On 5/11/26 8:47 PM, David Hildenbrand (Arm) wrote:
> >
> > We do have a call to pgalloc_tag_split() in __split_unmapped_folio(), invoked in
> > __folio_freeze_and_split_unmapped() before calling
> > zone_device_private_split_cb() when iterating the folios.
> 
> If I read the code correctly, pgalloc_tag_split() in
> __split_unmapped_folio() deals with device private pages' alloc tag. But
> what alloc_tag_sub_check() warns on are real system memory pages (device
> page's backing page), which are allocated by
> dmirror_devmem_alloc_page()/folio_page().

Sorry, I meant dmirror_devmem_alloc_page()/folio_alloc().

Thanks,
Zenghui