Re: [PATCH 0/2] Fix subsection vmemmap_populate logic

[Zhenhua Huang <quic_zhenhuah@quicinc.com>]

On 2024/11/21 15:12, Zhenhua Huang wrote:
> To perform memory hotplug operations, the memmap (aka struct page) will be
> updated. For arm64 with 4K page size, the typical granularity is 128M,
> which corresponds to a 2M memmap buffer.
> Commit 2045a3b8911b ("mm/sparse-vmemmap: generalise vmemmap_populate_hugepages()")
> optimizes this 2M buffer to be mapped with PMD huge pages. However,
> commit ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug")
> which supports 2M subsection hotplug granularity, causes other issues
> (refer to the change log of patch #1). The logic is adjusted to populate
> with huge pages only if the hotplug address/size is section-aligned.

Could any expert please help review ?

> 
> Zhenhua Huang (2):
>    arm64: mm: vmemmap populate to page level if not section aligned
>    arm64: mm: implement vmemmap_check_pmd for arm64
> 
>   arch/arm64/mm/mmu.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
>