linux-kernel - Re: [PATCH 3/9] vt: delete unneeded functions register_con_driver|take_over

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Date:	Wed, 08 May 2013 15:56:49 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Wang YanQing <udknight@...il.com>, airlied@...hat.com,
	linux-kernel@...r.kernel.org
CC:	gregkh@...uxfoundation.org, jslaby@...e.cz, alan@...ux.intel.com
Subject: Re: [PATCH 3/9] vt: delete unneeded functions register_con_driver|take_over_console

On 05/08/2013 02:13 PM, Wang YanQing wrote:
> Now there is no place use register_con_driver|take_over_console,
> and we can achieve their function with do_register_con_driver|
> do_take_over_console easily, so just delete them to reduce code duplication.
>
> Signed-off-by: Wang YanQing <udknight@...il.com>
> ---
>   drivers/tty/vt/vt.c     | 45 ---------------------------------------------
>   include/linux/console.h |  2 --
>   2 files changed, 47 deletions(-)
>
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index fbd447b..852d470 100644
> --- a/drivers/tty/vt/vt.c
> +++ b/drivers/tty/vt/vt.c
> @@ -3576,26 +3576,6 @@ err:
>   	return retval;
>   }
>
> -/**
> - * register_con_driver - register console driver to console layer
> - * @csw: console driver
> - * @first: the first console to take over, minimum value is 0
> - * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
> - *
> - * DESCRIPTION: This function registers a console driver which can later
> - * bind to a range of consoles specified by @first and @last. It will
> - * also initialize the console driver by calling con_startup().
> - */
> -int register_con_driver(const struct consw *csw, int first, int last)
> -{
> -	int retval;
> -
> -	console_lock();
> -	retval = do_register_con_driver(csw, first, last);
> -	console_unlock();
> -	return retval;
> -}
> -EXPORT_SYMBOL(register_con_driver);

Maybe register_con_driver() should print a deprecated warning
for a release or two before we remove it.

>   /**
>    * unregister_con_driver - unregister console driver from console layer
> @@ -3677,30 +3657,6 @@ int do_take_over_console(const struct consw *csw, int first, int last, int deflt
>   }
>   EXPORT_SYMBOL_GPL(do_take_over_console);
>
> -/*
> - *	If we support more console drivers, this function is used
> - *	when a driver wants to take over some existing consoles
> - *	and become default driver for newly opened ones.
> - *
> - *	take_over_console is basically a register followed by unbind
> - */
> -int take_over_console(const struct consw *csw, int first, int last, int deflt)
> -{
> -	int err;
> -
> -	err = register_con_driver(csw, first, last);
> -	/*
> -	 * If we get an busy error we still want to bind the console driver
> -	 * and return success, as we may have unbound the console driver
> -	 * but not unregistered it.
> -	 */
> -	if (err == -EBUSY)
> -		err = 0;
> -	if (!err)
> -		bind_con_driver(csw, first, last, deflt);
> -
> -	return err;
> -}
>
>   /*
>    * give_up_console is a wrapper to unregister_con_driver. It will only
> @@ -4264,6 +4220,5 @@ EXPORT_SYMBOL(console_blanked);
>   EXPORT_SYMBOL(vc_cons);
>   EXPORT_SYMBOL(global_cursor_default);
>   #ifndef VT_SINGLE_DRIVER
> -EXPORT_SYMBOL(take_over_console);

This effectively converts take_over_console() to require GPL now.


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