linux-kernel - Re: [PATCH v3 21/22] arm64: Delay enabling hardware DBM feature

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Message-ID: <20180308135555.yg6wdrarlpmedmmb@lakrids.cambridge.arm.com>
Date:   Thu, 8 Mar 2018 13:55:55 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Dave Martin <Dave.Martin@....com>
Cc:     Suzuki K Poulose <Suzuki.Poulose@....com>, ckadabi@...eaurora.org,
        ard.biesheuvel@...aro.org, marc.zyngier@....com,
        catalin.marinas@....com, will.deacon@....com,
        linux-kernel@...r.kernel.org, jnair@...iumnetworks.com,
        robin.murphy@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 21/22] arm64: Delay enabling hardware DBM feature

On Thu, Mar 08, 2018 at 01:53:13PM +0000, Dave Martin wrote:
> In practice, we don't race booting of two CPUs against each other
> IIUC.

Yup. Today, hotplugs are strictly serialized.

Several things would have to change for parallel hotplug to be feasible.

Thanks,
Mark.