linux-kernel - Re: [PATCH] init: Remove CONFIG_INIT

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Date:	Mon, 20 Oct 2014 15:06:13 -0700
From:	josh@...htriplett.org
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rob Landley <rob@...dley.net>,
	Frank Rowand <frowand.list@...il.com>,
	linux-kernel@...r.kernel.org,
	Chuck Ebbert <cebbert.lkml@...il.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Shuah Khan <shuah.kh@...sung.com>
Subject: Re: [PATCH] init: Remove CONFIG_INIT_FALLBACK

On Mon, Oct 20, 2014 at 03:04:36PM -0700, Andy Lutomirski wrote:
> CONFIG_INIT_FALLBACK adds config bloat without an obvious use case
> that makes it worth keeping around.  Delete it.
> 
> Signed-off-by: Andy Lutomirski <luto@...capital.net>
> ---
> 
> Bring on the blame :)

Reviewed-by: Josh Triplett <josh@...htriplett.org>
Blame is easier to bear when shared. :)

>  init/Kconfig | 16 ----------------
>  init/main.c  |  5 -----
>  2 files changed, 21 deletions(-)
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index ebbd5846478e..e84c6423a2e5 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1299,22 +1299,6 @@ source "usr/Kconfig"
>  
>  endif
>  
> -config INIT_FALLBACK
> -	bool "Fall back to defaults if init= parameter is bad"
> -	default y
> -	help
> -	  If enabled, the kernel will try the default init binaries if an
> -	  explicit request from the init= parameter fails.
> -
> -	  This can have unexpected effects.  For example, booting
> -	  with init=/sbin/kiosk_app will run /sbin/init or even /bin/sh
> -	  if /sbin/kiosk_app cannot be executed.
> -
> -	  The default value of Y is consistent with historical behavior.
> -	  Selecting N is likely to be more appropriate for most uses,
> -	  especially on kiosks and on kernels that are indended to be
> -	  run under the control of a script.
> -
>  config CC_OPTIMIZE_FOR_SIZE
>  	bool "Optimize for size"
>  	help
> diff --git a/init/main.c b/init/main.c
> index 2bd6105e5dc5..39dd52a3b78a 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -960,13 +960,8 @@ static int __ref kernel_init(void *unused)
>  		ret = run_init_process(execute_command);
>  		if (!ret)
>  			return 0;
> -#ifndef CONFIG_INIT_FALLBACK
>  		panic("Requested init %s failed (error %d).",
>  		      execute_command, ret);
> -#else
> -		pr_err("Failed to execute %s (error %d).  Attempting defaults...\n",
> -		       execute_command, ret);
> -#endif
>  	}
>  	if (!try_to_run_init_process("/sbin/init") ||
>  	    !try_to_run_init_process("/etc/init") ||
> -- 
> 1.9.3
> 
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