From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751519AbcFUXj5 (ORCPT <rfc822;w@1wt.eu>);
	Tue, 21 Jun 2016 19:39:57 -0400
Received: from mail.linuxfoundation.org ([140.211.169.12]:46257 "EHLO
	mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750731AbcFUXjz (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 21 Jun 2016 19:39:55 -0400
Date: Tue, 21 Jun 2016 16:38:57 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>, "Theodore Ts'o" <tytso@mit.edu>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] compat: remove compat_printk
Message-Id: <20160621163857.cf59ebebf39c38d67d71eb80@linux-foundation.org>
In-Reply-To: <20160617142903.3070388-1-arnd@arndb.de>
References: <20160617142903.3070388-1-arnd@arndb.de>
X-Mailer: Sylpheed 3.4.1 (GTK+ 2.24.23; x86_64-pc-linux-gnu)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, 17 Jun 2016 16:26:21 +0200 Arnd Bergmann <arnd@arndb.de> wrote:

> After 7e8e385aaf6e ("x86/compat: Remove sys32_vm86_warning"), this
> function has become unused, so we can remove it as well.

hm,

> @@ -1077,15 +1076,6 @@ static struct ctl_table kern_table[] = {
>  		.extra1		= &neg_one,
>  	},
>  #endif
> -#ifdef CONFIG_COMPAT
> -	{
> -		.procname	= "compat-log",
> -		.data		= &compat_log,
> -		.maxlen		= sizeof (int),
> -	 	.mode		= 0644,
> -		.proc_handler	= proc_dointvec,
> -	},
> -#endif

How do we know we can simply remove /proc/sys/kernel/compat-log without
breaking any userspace?