linux-kernel - Re: [PATCH V4 1/3] arm64/mm/hotplug: Register boot memory hot remove notifier earlier

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Message-ID: <20201001135144.GF21544@gaia>
Date:   Thu, 1 Oct 2020 14:51:44 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, will@...nel.org,
        gshan@...hat.com, Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        Steve Capper <steve.capper@....com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 1/3] arm64/mm/hotplug: Register boot memory hot remove
 notifier earlier

On Tue, Sep 29, 2020 at 07:24:45PM +0530, Anshuman Khandual wrote:
> This moves memory notifier registration earlier in the boot process from
> device_initcall() to early_initcall() which will help in guarding against
> potential early boot memory offline requests. Even though there should not
> be any actual offlinig requests till memory block devices are initialized
> with memory_dev_init() but then generic init sequence might just change in
> future. Hence an early registration for the memory event notifier would be
> helpful. While here, just skip the registration if CONFIG_MEMORY_HOTREMOVE
> is not enabled and also call out when memory notifier registration fails.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Steve Capper <steve.capper@....com>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Reviewed-by: Gavin Shan <gshan@...hat.com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>