linux-kernel - Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd

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Message-ID: <ZfsKIResY4YcxkxK@x1n>
Date: Wed, 20 Mar 2024 12:09:05 -0400
From: Peter Xu <peterx@...hat.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Jason Gunthorpe <jgg@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	Matthew Wilcox <willy@...radead.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"x86@...nel.org" <x86@...nel.org>, Mike Rapoport <rppt@...nel.org>,
	Muchun Song <muchun.song@...ux.dev>,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
	"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>
Subject: Re: [PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf()

On Wed, Mar 20, 2024 at 06:16:43AM +0000, Christophe Leroy wrote:
> At the first place that was to get a close fit between hardware 
> pagetable topology and linux pagetable topology. But obviously we 
> already stepped back for 512k pages, so let's go one more step aside and 
> do similar with 8M pages.
> 
> I'll give it a try and see how it goes.

So you're talking about 8M only for 8xx, am I right?

There seem to be other PowerPC systems use hugepd.  Is it possible that we
convert all hugepd into cont_pte form?

Thanks,

-- 
Peter Xu