Re: [PATCH] compat: remove compat_printk

[Andrew Morton]

On Fri, 17 Jun 2016 16:26:21 +0200 Arnd Bergmann <arnd@xxxxxxxx> 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?