linux-kernel - Re: [TECH TOPIC] Reaching consensus on CONFIG

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Message-ID: <20250917125951.GA1390993@nvidia.com>
Date: Wed, 17 Sep 2025 09:59:51 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: ksummit@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
	linux-mips@...r.kernel.org, linux-mm@...ck.org, imx@...ts.linux.dev,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Richard Weinberger <richard@....at>,
	Lucas Stach <l.stach@...gutronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Ankur Arora <ankur.a.arora@...cle.com>,
	David Hildenbrand <david@...hat.com>,
	Mike Rapoport <rppt@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Matthew Wilcox <willy@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Ira Weiny <ira.weiny@...el.com>, Nishanth Menon <nm@...com>,
	Heiko Stübner <heiko@...ech.de>,
	Alexander Sverdlin <alexander.sverdlin@...il.com>,
	"Chester A. Unal" <chester.a.unal@...nc9.com>,
	Sergio Paracuellos <sergio.paracuellos@...il.com>,
	Andreas Larsson <andreas@...sler.com>
Subject: Re: [TECH TOPIC] Reaching consensus on CONFIG_HIGHMEM phaseout

On Tue, Sep 09, 2025 at 11:23:37PM +0200, Arnd Bergmann wrote:

> I'm still collecting information about which of the remaining highmem
> users plan to keep updating their kernels and for what reason. 

On this topic of removing some parts of highmem, can we say goodbye to
kmap_high_get()? Only ARM uses it and only for
!cache_is_vipt_nonaliasing() systems.

Maybe if so then HASHED_PAGE_VIRTUAL can go too?

Jason