linux-kernel - Re: [PATCH v3 1/6] irqchip: sifive-plic: Pre-compute context hart base and enable base

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Message-ID: <20181217182520.GB7086@infradead.org>
Date:   Mon, 17 Dec 2018 10:25:20 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Anup Patel <anup@...infault.org>
Cc:     Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoph Hellwig <hch@...radead.org>,
        Atish Patra <atish.patra@....com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/6] irqchip: sifive-plic: Pre-compute context hart
 base and enable base

On Fri, Nov 30, 2018 at 01:32:02PM +0530, Anup Patel wrote:
> This patch does following optimizations:
> 1. Pre-compute hart base for each context handler
> 2. Pre-compute enable base for each context handler
> 3. Have enable lock for each context handler instead
> of global plic_toggle_lock

All of which is pretty obvious from reading the patch.  The big question
that needs to be answered in the changelog is why you do that.