linux-kernel - Re: [PATCH v4 05/13] irqchip: add initial support for ompic

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Message-ID: <86vaix5fmr.fsf@arm.com>
Date:   Mon, 30 Oct 2017 06:11:40 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Stafford Horne <shorne@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonas Bonn <jonas@...thpole.se>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        devicetree@...r.kernel.org, openrisc@...ts.librecores.org
Subject: Re: [PATCH v4 05/13] irqchip: add initial support for ompic

On Mon, Oct 30 2017 at  1:18:06 pm GMT, Stafford Horne <shorne@...il.com> wrote:
> On Mon, Oct 30, 2017 at 02:29:18AM +0000, Marc Zyngier wrote:
>> On Mon, Oct 30 2017 at  8:11:15 am GMT, Stafford Horne <shorne@...il.com> wrote:
>> > From: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
>> >
>> > IPI driver for the Open Multi-Processor Interrupt Controller (ompic) as
>> > described in the Multi-core support section of the OpenRISC 1.2
>> > architecture specification:
>> >
>> >   https://github.com/openrisc/doc/raw/master/openrisc-arch-1.2-rev0.pdf
>> >
>> > Each OpenRISC core contains a full interrupt controller which is used in
>> > the SMP architecture for interrupt balancing.  This IPI device, the
>> > ompic, is the only external device required for enabling SMP on
>> > OpenRISC.
>> >
>> > Pending ops are stored in a memory bit mask which can allow multiple
>> > pending operations to be set and serviced at a time. This is mostly
>> > borrowed from the alpha IPI implementation.
>> >
>> > Cc: Marc Zyngier <marc.zyngier@....com>
>> > Acked-by: Rob Herring <robh@...nel.org>
>> > Signed-off-by: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
>> > [shorne@...il.com: converted ops to bitmask, wrote commit message]
>> > Signed-off-by: Stafford Horne <shorne@...il.com>
>> 
>> Reviewed-by: Marc Zyngier <marc.zyngier@....com>
>
> Thanks
>
>> Side question: what is your merge strategy for this? I can take it
>> through the irqchip tree as it is standalone, but I'm open to other
>> suggestions.
>
> For me its easier if I just take it through the openrisc tree, as
> there are dependencies between this series and the irqchip driver.
> If you are ok with that I can make a note to Linus indicating so in
> the pull request.

No problem, that's OK with me.

> My plan is to send this series during the 4.15 merge window.

Make sure this is in -next (when it comes back to life...).

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny.