linux-kernel - Re: [PATCH V9 05/21] csky: System Call

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Message-ID: <CAK8P3a3bNST+ZuPjLG0_sHjC=Ac0ir1omhHvMn9tz4zs+Kg9yw@mail.gmail.com>
Date:   Wed, 17 Oct 2018 17:02:33 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Guo Ren <ren_guo@...ky.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        David Miller <davem@...emloft.net>,
        gregkh <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rob Herring <robh@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>, c-sky_gcc_upstream@...ky.com
Subject: Re: [PATCH V9 05/21] csky: System Call

On Tue, Oct 16, 2018 at 5:01 AM Guo Ren <ren_guo@...ky.com> wrote:
>
> This patch adds files related to syscall.
>
> Signed-off-by: Guo Ren <ren_guo@...ky.com>
> Cc: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Arnd Bergmann <arnd@...db.de>

I had a detailed look at this one and provided lots of comments, however
one tiny thing escaped me:

> +#define __NR_set_thread_area   (__NR_arch_specific_syscall + 0)
> +__SYSCALL(__NR_set_thread_area, sys_set_thread_area)
> +#define __NR_cacheflush                (__NR_arch_specific_syscall + 4)
> +__SYSCALL(__NR_cacheflush, sys_cacheflush)

It's odd that the second one uses __NR_arch_specific_syscall + 4 rather
than +1. If you can still change that changing too much other stuff,
that might avoid some head-scratching later. If it causes problems,
just leave it and maybe add a comment saying that the numbers
inbetween are still available.

      Arnd