linux-kernel - Re: [PATCH v3 3/3] RISC-V: Access CSRs using CSR numbers

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Message-ID: <20190424063045.GC10400@infradead.org>
Date:   Tue, 23 Apr 2019 23:30:45 -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 v3 3/3] RISC-V: Access CSRs using CSR numbers

On Mon, Apr 15, 2019 at 09:37:27AM +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.
> 
> Signed-off-by: Anup Patel <anup.patel@....com>

Looks fine:

Reviewed-by: Christoph Hellwig <hch@....de>