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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250919143436.GC2132010@nvidia.com>
Date: Fri, 19 Sep 2025 11:34:36 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>, 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 Fri, Sep 19, 2025 at 04:22:20PM +0200, Arnd Bergmann wrote:

> SAM9X7 in 2023 added DDR3 mode with up to 256MB according to
> the datasheet, no idea why they chose not to support more,

Quite possible the internal SOC wiring only has 28 address lines. :)

I am right it sounds like we can drop vivt cache support with highmem?
vivt is alot easier to understand if kmap isn't running around
creating virtual addresses aliases!

Jason