linux-kernel - Re: [RFC PATCH 08/10] mm: hugetlb: disable CMA if liveupdate is enabled

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Message-ID: <CA+CK2bBeJwACBiKsuXLcbzC4m0zLhu0yNg2HDGR=AQGeEVCJjg@mail.gmail.com>
Date: Tue, 23 Dec 2025 13:16:57 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Pratyush Yadav <pratyush@...nel.org>
Cc: Mike Rapoport <rppt@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	David Hildenbrand <david@...nel.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, Jonathan Corbet <corbet@....net>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Muchun Song <muchun.song@...ux.dev>, 
	Oscar Salvador <osalvador@...e.de>, Alexander Graf <graf@...zon.com>, David Matlack <dmatlack@...gle.com>, 
	David Rientjes <rientjes@...gle.com>, Jason Gunthorpe <jgg@...dia.com>, 
	Samiullah Khawaja <skhawaja@...gle.com>, Vipin Sharma <vipinsh@...gle.com>, 
	Zhu Yanjun <yanjun.zhu@...ux.dev>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	linux-doc@...r.kernel.org, kexec@...ts.infradead.org
Subject: Re: [RFC PATCH 08/10] mm: hugetlb: disable CMA if liveupdate is enabled

On Sat, Dec 6, 2025 at 6:03 PM Pratyush Yadav <pratyush@...nel.org> wrote:
>
> Hugetlb live update support does not yet work with CMA. Print a warning
> and disable CMA if the config for live updating hugetlb is enabled, and
> liveupdate is enabled at runtime.

Could you please elaborate this commit to explain why it is not
supported, and what it would take to support CMA.

Thanks,
Pasha