linux-kernel - Re: [PATCH 3/3] RISC-V: Access CSRs using CSR numbers

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Message-ID: <20190413075548.GC30428@infradead.org>
Date:   Sat, 13 Apr 2019 00:55:48 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Anup Patel <Anup.Patel@....com>
Cc:     Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Atish Patra <Atish.Patra@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 3/3] RISC-V: Access CSRs using CSR numbers

On Sat, Apr 13, 2019 at 07:39:44AM +0000, Anup Patel wrote:
> We should prefer accessing CSRs using their CSR numbers because:
> 1. It compiles fine with older toolchains.
> 2. We can use latest CSR names in #define macro names of CSR numbers
>    as-per RISC-V spec.
> 3. We can access newly added CSRs even if toolchain does not recognize
>    newly addes CSRs by name.

This looks mostly fine, but also please remove all the comments
regarding using sptbr instead of satp now that they are not true
anymore.