linux-kernel - Re: [PATCH 4/8] asm-generic: Make time32 syscall numbers optional

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Message-ID: <CAMuHMdVbz=_GFMnKx4PuxpmG9jpdA=Do2XnR3bY5wRZPM3G+Gw@mail.gmail.com>
Date:   Tue, 19 Feb 2019 21:06:04 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     y2038 Mailman List <y2038@...ts.linaro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Yury Norov <yury.norov@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
        "moderated list:H8/300 ARCHITECTURE" 
        <uclinux-h8-devel@...ts.sourceforge.jp>,
        Stafford Horne <shorne@...il.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Guo Ren <guoren@...nel.org>, Greentime Hu <green.hu@...il.com>,
        linux-riscv@...ts.infradead.org, Guan Xuetao <gxt@....edu.cn>
Subject: Re: [PATCH 4/8] asm-generic: Make time32 syscall numbers optional

Hi Arnd,

On Tue, Feb 19, 2019 at 3:34 AM Arnd Bergmann <arnd@...db.de> wrote:
> We don't want new architectures to even provide the old 32-bit time_t
> based system calls any more, or define the syscall number macros.
>
> Add a new __ARCH_WANT_TIME32_SYSCALLS macro that gets enabled for all
> existing 32-bit architectures so we don't change any current behavior.

... (only) 32-bit architectures using the generic syscall list, right?

> Since this symbol is evaluated in user space as well, we cannot use
> a Kconfig CONFIG_* macro but have to define it in uapi/asm/unistd.h.
>
> On 64-bit architectures, the same system call numbers mostly refer to
> the system calls we want to keep, as they already pass 64-bit time_t.
>
> As new architectures no longer provide these, we need new exceptions
> in checksyscalls.sh.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arc/include/uapi/asm/unistd.h       |  1 +
>  arch/arm64/include/uapi/asm/unistd.h     |  1 +
>  arch/c6x/include/uapi/asm/unistd.h       |  1 +
>  arch/csky/include/uapi/asm/unistd.h      |  1 +
>  arch/h8300/include/uapi/asm/unistd.h     |  1 +
>  arch/hexagon/include/uapi/asm/unistd.h   |  1 +
>  arch/nds32/include/uapi/asm/unistd.h     |  1 +
>  arch/nios2/include/uapi/asm/unistd.h     |  1 +
>  arch/openrisc/include/uapi/asm/unistd.h  |  1 +
>  arch/riscv/include/uapi/asm/unistd.h     |  3 ++
>  arch/unicore32/include/uapi/asm/unistd.h |  1 +
>  include/uapi/asm-generic/unistd.h        | 36 ++++++++++++++++++++++++
>  scripts/checksyscalls.sh                 |  7 +++++
>  13 files changed, 56 insertions(+)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds