linux-kernel - Re: [RFC PATCH] arm64/mm: Remove randomization of the linear map

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Message-Id: <174592931036.425225.4448190520420242534.b4-ty@kernel.org>
Date: Tue, 29 Apr 2025 21:27:43 +0100
From: Will Deacon <will@...nel.org>
To: linux-arm-kernel@...ts.infradead.org,
	Ard Biesheuvel <ardb+git@...gle.com>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Ard Biesheuvel <ardb@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Mark Rutland <mark.rutland@....com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Kees Cook <kees@...nel.org>
Subject: Re: [RFC PATCH] arm64/mm: Remove randomization of the linear map

On Tue, 18 Mar 2025 14:49:50 +0100, Ard Biesheuvel wrote:
> Since commit
> 
>   97d6786e0669 ("arm64: mm: account for hotplug memory when randomizing the linear region")
> 
> the decision whether or not to randomize the placement of the system's
> DRAM inside the linear map is based on the capabilities of the CPU
> rather than how much memory is present at boot time. This change was
> necessary because memory hotplug may result in DRAM appearing in places
> that are not covered by the linear region at all (and therefore
> unusable) if the decision is solely based on the memory map at boot.
> 
> [...]

Applied to arm64 (for-next/mm), thanks!

[1/1] arm64/mm: Remove randomization of the linear map
      https://git.kernel.org/arm64/c/1db780bafa4c

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev