linux-kernel - Re: [PATCH] arm64: proton-pack: Fix hard lockup when !MITIGATE_SPECTRE_BRANCH

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Message-Id: <176399113353.3273155.581458888814324419.b4-ty@kernel.org>
Date: Mon, 24 Nov 2025 14:41:02 +0000
From: Will Deacon <will@...nel.org>
To: linux-arm-kernel@...ts.infradead.org,
	Jonathan Marek <jonathan@...ek.ca>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	James Morse <james.morse@....com>,
	Douglas Anderson <dianders@...omium.org>,
	Trilok Soni <quic_tsoni@...cinc.com>,
	shechenglong <shechenglong@...sion.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Shameer Kolothum <skolothumtho@...dia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: proton-pack: Fix hard lockup when !MITIGATE_SPECTRE_BRANCH_HISTORY

On Mon, 17 Nov 2025 00:12:08 -0500, Jonathan Marek wrote:
> The "drop print" commit removed the whole branch and not just the print.
> For some ARM64 cpus, this leads to hard lockup when
> CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not enabled.
> 
> 

Applied (with your SoB) to arm64 (for-next/fixes), thanks!

[1/1] arm64: proton-pack: Fix hard lockup when !MITIGATE_SPECTRE_BRANCH_HISTORY
      https://git.kernel.org/arm64/c/165eb13e485c

I'd be inclined to remove CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY
entirely (i.e. make it unconditional) given the number of CPUs
affected and the dynamic controls we already have for the mitigation.

Cheers,
-- 
Will

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