linux-kernel - Re: [PATCH v2 3/5] irqchip: RISC-V Local Interrupt Controller Driver

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Message-ID: <20180910221902.GB7368@infradead.org>
Date:   Mon, 10 Sep 2018 15:19:02 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Anup Patel <anup@...infault.org>,
        Christoph Hellwig <hch@...radead.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Atish Patra <atish.patra@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 3/5] irqchip: RISC-V Local Interrupt Controller Driver

On Mon, Sep 10, 2018 at 09:37:59PM +0200, Thomas Gleixner wrote:
> Processor local interrupts really should be architected and there are
> really not that many of them.

And that is what they are.

> But well, RISC-V decided obvsiouly not to learn from mistakes made by
> others.

I don't think that is the case.  I think Atup misreads what reserved
means - if you look at section 2.3 of the RISC-V privileged spec
it clearly states that reserved fields are for future use and not
for vendor specific use.