linux-kernel - Re: [PATCH v3 2/3] RISC-V: Add interrupt related SCAUSE defines in asm/csr.h

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Date:   Tue, 23 Apr 2019 23:29:47 -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 2/3] RISC-V: Add interrupt related SCAUSE defines in
 asm/csr.h

On Mon, Apr 15, 2019 at 09:37:23AM +0000, Anup Patel wrote:
> This patch adds SCAUSE interrupt flag and SCAUSE interrupt related
> defines to asm/csr.h. We also use these defines in kernel/irq.c and
> express SIE/SIP flags in-terms of SCAUSE interrupt causes.

I'm not a fan of this.  For one this pollutes csr.h with bits not really
needed by most users, and it makes adding the M-mode nommu port which has
to use the M-mode causes much harder:

http://git.infradead.org/users/hch/misc.git/commitdiff/1221f5c32345ebe7ea2c1cd6e8a01ad4b422aaba