linux-kernel - Re: [PATCH 4/4] mm: drop HIGHPTE support altogether

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Message-ID: <CACRpkdbsN9WNZ4Fo++FvK+2xxe6VF+66oaBgs4+o3oGUfW4OaA@mail.gmail.com>
Date: Wed, 11 Dec 2024 14:53:11 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org, linux-rt-devel@...ts.linux.dev, 
	Ard Biesheuvel <ardb@...nel.org>, Clark Williams <clrkwllms@...nel.org>, Jason Baron <jbaron@...mai.com>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Matthew Wilcox <willy@...radead.org>, Peter Zijlstra <peterz@...radead.org>, 
	Russell King <linux@...linux.org.uk>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 4/4] mm: drop HIGHPTE support altogether

On Tue, Dec 10, 2024 at 5:06 PM Arnd Bergmann <arnd@...nel.org> wrote:

> From: Arnd Bergmann <arnd@...db.de>
>
> With both x86 and arm having dropped CONFIG_HIGHPTE support, no
> architecture is left using it, so remove the remnants in common code.
>
> It is likely that further cleanups are possible in the page table
> code but those are not obvious from the config options.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Linus Walleij <linus.walleij@...aro.org>

Mapping PTEs in highmem makes no sense to me, it's better
that we try other solutions to move away from highmem use
altogether.

Yours,
Linus Walleij