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

[Catalin Marinas]

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 at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Cc: Marc Zyngier <maz at kernel.org>
> Cc: Steve Capper <steve.capper at arm.com>
> Cc: Mark Brown <broonie at kernel.org>
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: linux-kernel at vger.kernel.org
> Reviewed-by: Gavin Shan <gshan at redhat.com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>

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