linux-kernel - Re: [RFC][PATCH] sysctl: Remove the sysctl system call

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Message-ID: <87v9t7gq2b.fsf@x220.int.ebiederm.org>
Date:   Wed, 02 Oct 2019 09:49:48 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Kees Cook <keescook@...omium.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andi Kleen <andi@...stfloor.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Apelete Seketeli <apelete@...eteli.net>,
        Chee Nouk Phoon <cnphoon@...era.com>,
        Chris Zankel <chris@...kel.net>,
        Christian Ruppert <christian.ruppert@...lis.com>,
        Greg Ungerer <gerg@...inux.org>, Helge Deller <deller@....de>,
        Hongliang Tao <taohl@...ote.com>,
        Huacai Chen <chenhc@...ote.com>,
        Jonas Jensen <jonas.jensen@...il.com>,
        Josh Boyer <jwboyer@...il.com>, Jun Nie <jun.nie@...aro.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Ley Foon Tan <lftan@...era.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Max Filippov <jcmvbkbc@...il.com>,
        Olof Johansson <olof@...om.net>,
        Paul Burton <paul.burton@...s.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Pierrick Hascoet <pierrick.hascoet@...lis.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Roland Stigge <stigge@...com.de>,
        Vineet Gupta <vgupta@...opsys.com>
Subject: Re: [RFC][PATCH] sysctl: Remove the sysctl system call

Arnd Bergmann <arnd@...db.de> writes:

> On Wed, Oct 2, 2019 at 12:54 AM Eric W. Biederman <ebiederm@...ssion.com> wrote:

>> arch/arm/configs/lpc32xx_defconfig:CONFIG_SYSCTL_SYSCALL=y
>> arch/arm/configs/moxart_defconfig:CONFIG_SYSCTL_SYSCALL=y
>
> Ancient hardware, but still in active use. These tend to have very little
> RAM, but they both enable CONFIG_PROC_FS.

You actually have to enable CONFIG_PROC_FS to enable
CONFIG_SYSCTL_SYSCALL at this point.  CONFIG_SYSCTL_SYSCALL is just an
emulation of the old interface built on top of /proc.

Thank you for the feedback.

Eric