Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 10 Sep 2018 06:49:15 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Christoph Hellwig <hch@infradead.org>,
        Palmer Dabbelt <palmer@sifive.com>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Anup Patel <anup@brainfault.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        linux-kernel@vger.kernel.org, Atish Patra <atish.patra@wdc.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        linux-riscv@lists.infradead.org
Subject: Re: [PATCH v2 3/5] irqchip: RISC-V Local Interrupt Controller Driver
Message-ID: <20180910134915.GB30774@infradead.org>
References: <20180906123651.28500-1-anup@brainfault.org>
 <20180906123651.28500-4-anup@brainfault.org>
 <20180906140628.GA10580@infradead.org>
 <alpine.DEB.2.21.1809081241310.1402@nanos.tec.linutronix.de>
 <20180910132924.GA6987@infradead.org>
 <alpine.DEB.2.21.1809101533330.1292@nanos.tec.linutronix.de>
 <alpine.DEB.2.21.1809101536410.1292@nanos.tec.linutronix.de>
 <20180910133902.GB21593@infradead.org>
 <alpine.DEB.2.21.1809101544560.1292@nanos.tec.linutronix.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <alpine.DEB.2.21.1809101544560.1292@nanos.tec.linutronix.de>
User-Agent: Mutt/1.9.2 (2017-12-15)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Sep 10, 2018 at 03:45:42PM +0200, Thomas Gleixner wrote:
> > He has an irqchip that is called from the RISC-V exception handler
> > when the interrupt flag is set in scause and then dispatches to one
> > of:  IPI, timer, actual irqchip.
> 
> So the per cpu timer is the only per cpu interrupt and that thing is used
> unconditionally, right?

Yes.  external is chained and IPI is still handled explicitly.