linux-kernel - [PATCH 0/3] fs: Support compiling out the pivot

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Date:   Fri, 24 Feb 2017 19:21:48 -0500
From:   bosrsf04@...il.com
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andy Lutomirski <luto@...nel.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Petr Mladek <pmladek@...e.com>, Helge Deller <deller@....de>,
        Rik van Riel <riel@...hat.com>,
        Thomas Garnier <thgarnie@...gle.com>,
        Parav Pandit <pandit.parav@...il.com>,
        "seokhoon . yoon" <iamyooon@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...el.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     josh@...htriplett.org, brkkurek192@...il.com, conorcurry@...il.com,
        fanofbond138@...il.com, Brian Ashworth <bosrsf04@...il.com>
Subject: [PATCH 0/3] fs: Support compiling out the pivot_root syscall

From: Brian Ashworth <bosrsf04@...il.com>

This patch series will allow for the pivot_root syscall to be made
optional. The first patch refactors the functions that are required
by pivot_root so they can be accessed outside of fs/namespace.c. The
second patch moves the pivot_root syscall to its own file. The third
adds a Kconfig option and conditional compilation to the Makefile.

The pivot_root syscall is not needed on systems that do not use
any intermediate filesystem. Allowing for pivot_root to be
ommitted from the kernel will aid in the tinification efforts.

Brian Ashworth (3):
  Makes functions used by pivot_root accessible
  Extracts pivot_root so it can be made optional
  Allows for the pivot_root syscall to be omitted

 fs/Makefile     |   2 +
 fs/mount.h      |  24 +++++++++
 fs/namespace.c  | 150 +++-----------------------------------------------------
 fs/pivot_root.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++++
 init/Kconfig    |  10 ++++
 kernel/sys_ni.c |   1 +
 6 files changed, 172 insertions(+), 144 deletions(-)
 create mode 100644 fs/pivot_root.c

-- 
2.11.1