linux-kernel - Re: [PATCH 7/8] fs: make devpts/inode.c explicitly non-modular

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Date:	Thu, 17 Dec 2015 11:46:26 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-kernel@...r.kernel.org
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Josh Triplett <josh@...htriplett.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH 7/8] fs: make devpts/inode.c explicitly non-modular

Hi Paul,

On 12/17/2015 11:11 AM, Paul Gortmaker wrote:
> The Kconfig currently controlling compilation of this code is:
> 
> config UNIX98_PTYS
>     bool "Unix98 PTY support" if EXPERT
> 
> ...meaning that it currently is not being built as a module by anyone.
> 
> Lets remove the couple traces of modularity so that when reading the
> driver there is no doubt it is builtin-only.
> 
> Since module_init translates to device_initcall in the non-modular
> case, the init ordering gets bumped to one level earlier when we
> use the more appropriate fs_initcall here.  However we've made similar
> changes before without any fallout and none is expected here either.

There's a slim possibility moving the devpts init up to fs level
(where it belongs) may impact certain broken userspace setups, since the
system devpts instance would now always be mounted before initramfs.

I'm still waiting to receive a reply back from Eric Biederman about
that userspace configuration, so I don't have a definitive answer on
whether this patch will break that setup.

Regards,
Peter Hurley

> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Peter Hurley <peter@...leysoftware.com>
> Cc: Josh Triplett <josh@...htriplett.org>
> Cc: David Howells <dhowells@...hat.com>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>  fs/devpts/inode.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
> index c35ffdc12bba..3c89b1f0804f 100644
> --- a/fs/devpts/inode.c
> +++ b/fs/devpts/inode.c
> @@ -12,7 +12,6 @@
>  
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
> -#include <linux/module.h>
>  #include <linux/init.h>
>  #include <linux/fs.h>
>  #include <linux/sched.h>
> @@ -703,4 +702,4 @@ static int __init init_devpts_fs(void)
>  	}
>  	return err;
>  }
> -module_init(init_devpts_fs)
> +fs_initcall(init_devpts_fs)
> 

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