linux-kernel - Re: [PATCH v4 2/4] RISC-V: Add riscv_isa reprensenting ISA features common across CPUs

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Message-ID: <20190807065119.GA7825@infradead.org>
Date:   Tue, 6 Aug 2019 23:51:19 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Atish Patra <atish.patra@....com>
Cc:     linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Alan Kao <alankao@...estech.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Anup Patel <anup.patel@....com>,
        Johan Hovold <johan@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv@...ts.infradead.org, Enrico Weigelt <info@...ux.net>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 2/4] RISC-V: Add riscv_isa reprensenting ISA features
 common across CPUs

On Fri, Aug 02, 2019 at 09:27:21PM -0700, Atish Patra wrote:
> From: Anup Patel <anup.patel@....com>
> 
> This patch adds riscv_isa integer to represent ISA features common
> across all CPUs. The riscv_isa is not same as elf_hwcap because
> elf_hwcap will only have ISA features relevant for user-space apps
> whereas riscv_isa will have ISA features relevant to both kernel
> and user-space apps.
> 
> One of the use case is KVM hypervisor where riscv_isa will be used
> to do following operations:

Please add this to the kvm series.  Right now this is just dead code.