linux-kernel - Re: [PATCH V4 0/4] arch: patch_text: Fixup last cpu should be master

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Date:   Fri,  8 Apr 2022 14:58:45 +0100
From:   Will Deacon <will@...nel.org>
To:     gregkh@...uxfoundation.org, guoren@...nel.org, arnd@...db.de
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arch@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        Guo Ren <guoren@...ux.alibaba.com>, linux-csky@...r.kernel.org
Subject: Re: [PATCH V4 0/4] arch: patch_text: Fixup last cpu should be master

On Thu, 7 Apr 2022 15:33:19 +0800, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
> 
> These patch_text implementations are using stop_machine_cpuslocked
> infrastructure with atomic cpu_count. The original idea: When the
> master CPU patch_text, the others should wait for it. But current
> implementation is using the first CPU as master, which couldn't
> guarantee the remaining CPUs are waiting. This patch changes the
> last CPU as the master to solve the potential risk.
> 
> [...]

Applied first patch only to arm64 (for-next/fixes), thanks!

[1/4] arm64: patch_text: Fixup last cpu should be master
      https://git.kernel.org/arm64/c/31a099dbd91e

Cheers,
-- 
Will

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