linux-kernel - Re: [PATCH v1 1/3] kho: Adopt KHO radix tree data structures

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Message-ID: <20251006225055.GW3360665@nvidia.com>
Date: Mon, 6 Oct 2025 19:50:55 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: Jason Miu <jasonmiu@...gle.com>, Alexander Graf <graf@...zon.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Baoquan He <bhe@...hat.com>, Changyuan Lyu <changyuanl@...gle.com>,
	David Matlack <dmatlack@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	Mike Rapoport <rppt@...nel.org>,
	Pratyush Yadav <pratyush@...nel.org>, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v1 1/3] kho: Adopt KHO radix tree data structures

On Mon, Oct 06, 2025 at 01:26:57PM -0400, Pasha Tatashin wrote:
> > > +struct kho_radix_tree {
> > > +     unsigned long table[PAGE_SIZE / sizeof(unsigned long)];
> >
> > This should be phys_addr_t.
> 
> Maybe u64 ? This is a preserved data, I would specify the size, and
> not care about 32-bit arches. Also, if we ever have to support larger
> physical spaces, this radix tree version would need to be bumped
> anyway.

Yeah, that is a good plan.

Jason