[PATCH 0/2] Fix subsection vmemmap_populate logic

[Andrew Morton]

On Fri, 6 Dec 2024 17:13:39 +0800 Zhenhua Huang <quic_zhenhuah at quicinc.com> wrote:

> 
> 
> On 2024/11/28 15:26, Zhenhua Huang wrote:
> > 
> > 
> > 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 ?
> 
> Gentle reminder for review..
> 


MM developers work on the linux-mm mailing list, which was not cc'ed.

Please address Catalin's review comment
(https://lkml.kernel.org/r/Z1Mwo5OajFZQYlOg@arm.com) then resend a v2
series with the appropriate cc's.