linux-kernel - Re: [PATCH v2 0/4] Hot plug support for the Armada 38x SoCs

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Date:	Fri, 21 Nov 2014 21:40:52 -0500
From:	Jason Cooper <jason@...edaemon.net>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] Hot plug support for the Armada 38x SoCs

On Thu, Oct 30, 2014 at 12:39:40PM +0100, Gregory CLEMENT wrote:
> Hi,
> 
> This patch set is the second version of the series adding the hot plug
> and also kexec support for the Armada 38x Socs.
> 
> If nobody object we could push them in linux-next.
> 
> The first patch was done in order to have the same code between Armada
> XP and the Cortex A9 based mvebu SoCs. In order to ensure the the
> backward compatibility for the device tree, it is only a preliminary
> work for it.
> 
> The second patch moves the SCU power up sequence in a dedicated
> assembly function. It was done in order to reuse it in the 3rd patch.
> 
> The third patch fixes the secondary startup for the cortex A9 mvebu
> SoC. Indeed, the initial code was written with the assumption the SCU
> will be always power on, which is not only true especially in the
> kexec case.
> 
> These 2 patches may worth to be pushed to the stable kernel.
> 
> Then the last patch adds the CPU hotplug support for Armada 38x. I
> tested the hotplug using the /sys/devices/system/cpu/cpu1/online
> virtual file.  I also tested the kexec feature and managed to switch
> to a new kernel using kexec.
> 
> Thanks,
> 
> Gregory
> 
> Changelog:
> 
> v1 -> v2:
> 
> - Fix typo and improve the comment explaining why we need to keep the
>   .smp filed in the 1st patch.
> 
> - Add a prefix to the function power_up_scu function to keep it
>   private and not "pollute" the global namespace.
> 
> Gregory CLEMENT (4):
>   ARM: mvebu: Clean-up the Armada XP support
>   ARM: mvebu: Move SCU power up in a function
>   ARM: mvebu: Fix the secondary startup for Cortex A9 SoC
>   ARM: mvebu: Implement the CPU hotplug support for the Armada 38x SoCs
> 
>  arch/arm/mach-mvebu/armada-370-xp.h |  6 -----
>  arch/arm/mach-mvebu/board-v7.c      |  5 ++++
>  arch/arm/mach-mvebu/coherency.c     |  1 -
>  arch/arm/mach-mvebu/cpu-reset.c     |  1 -
>  arch/arm/mach-mvebu/headsmp-a9.S    |  1 +
>  arch/arm/mach-mvebu/platsmp-a9.c    | 53 +++++++++++++++++++++++++++++++++++--
>  arch/arm/mach-mvebu/platsmp.c       |  2 ++
>  arch/arm/mach-mvebu/pmsu.c          |  3 +--
>  arch/arm/mach-mvebu/pmsu.h          |  2 ++
>  arch/arm/mach-mvebu/pmsu_ll.S       | 20 +++++++++-----
>  10 files changed, 75 insertions(+), 19 deletions(-)

Applied to mvebu/soc with Thomas' Reviewed-by and Tested-by.

thx,

Jason.
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