linux-kernel - Re: [PATCH 0/2] Support compiling out the prctl syscall

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Date:   Tue, 8 Nov 2016 19:30:12 -0500 (EST)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Josh Triplett <josh@...htriplett.org>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Thomas Garnier <thgarnie@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Zefan Li <lizefan@...wei.com>,
        Li Bin <huawei.libin@...wei.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Alex Thorlton <athorlton@....com>,
        Michal Hocko <mhocko@...e.com>,
        Mateusz Guzik <mguzik@...hat.com>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        John Stultz <john.stultz@...aro.org>,
        Al Viro <viro@...iv.linux.org.uk>, Zach Brown <zab@...hat.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Dave Hansen <dave.hansen@...el.com>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH 0/2] Support compiling out the prctl syscall

On Tue, 8 Nov 2016, Josh Triplett wrote:

> Some embedded systems can do without the prctl syscall, saving some space.
> 
> This also avoids regular increases in tinyconfig size as people add more
> non-optional functionality to prctl (observed via the 0-day kernel
> infrastructure).
> 
> The first patch moves prctl and all its helpers into a separate source file,
> kernel/prctl.c, to allow making it optional via the Makefile without any
> ifdefs.  The second patch adds the Kconfig option to make prctl optional.

Excellent.  For both patches:

Acked-by: Nicolas Pitre <nico@...aro.org>

> 
> Josh Triplett (2):
>   kernel: Move prctl and helpers from kernel/sys.c to new kernel/prctl.c
>   kernel: Support compiling out the prctl syscall
> 
>  init/Kconfig    |  12 +-
>  kernel/Makefile |   1 +-
>  kernel/prctl.c  | 684 +++++++++++++++++++++++++++++++++++++++++++++++++-
>  kernel/sys.c    | 672 +------------------------------------------------
>  kernel/sys_ni.c |   1 +-
>  5 files changed, 698 insertions(+), 672 deletions(-)
>  create mode 100644 kernel/prctl.c
> 
> base-commit: e3a00f68e426df24a5fb98956a1bd1b23943aa1e
> -- 
> git-series 0.8.11
>