Re: [PATCH] mm/ptdesc: Derive from the compound head in page_ptdesc()

[Anshuman Khandual]

On 10/11/25 7:08 PM, Matthew Wilcox wrote:
> On Mon, Nov 10, 2025 at 06:37:25AM +0000, Anshuman Khandual wrote:
>> struct ptdesc (including all relevant helpers) support multi order compound
>> pages. But page_ptdesc() coverts given page into its own ptdesc rather than
>> deriving from its compound head as would have been expected otherwise. Just
>> change the macro to fetch the struct ptdesc from the compound head instead,
>> so that the same struct ptdesc is reached from all tail pages.
> 
> Please review
> https://lore.kernel.org/linux-mm/20251020001652.2116669-1-willy@xxxxxxxxxxxxx/
> instead.

Sure, will do. Thanks for the pointer.