Re: [PATCH v2 11/11] Documentation/mm: update DAX vmemmap deduplication docs

[Qi Zheng <qi.zheng@linux.dev>]

On 9/8/26 11:03 AM, Muchun Song wrote:
> Device DAX now uses the common per-zone shared tail page for vmemmap
> deduplication. The old documentation still described a DAX-specific
> layout with a separately populated tail vmemmap page and half the HugeTLB
> savings.
> 
> Update the generic and powerpc documentation to describe the shared layout.
> In the powerpc document, keep the radix and 64K-specific details, drop the
> duplicated 4K PUD arithmetic, and replace the repeated device-dax diagrams
> with a single parameterized PMD/PUD diagram.
> 
> Signed-off-by: Muchun Song <songmuchun@bytedance.com>
> ---
> v2:
> - Clarify the commit message to state that the 4K PUD arithmetic is
>    intentionally dropped reported by Sashiko.
> ---
>   Documentation/arch/powerpc/vmemmap_dedup.rst | 90 ++++----------------
>   Documentation/mm/vmemmap_dedup.rst           | 32 +------
>   2 files changed, 21 insertions(+), 101 deletions(-)

Acked-by: Qi Zheng <qi.zheng@linux.dev>

Thanks,
Qi