linux-kernel - Re: [PATCH] tty: move the async flags from the serial code into the tty includes

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Message-ID: <5034CE65.7040607@suse.cz>
Date:	Wed, 22 Aug 2012 14:19:49 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	shijie8@...il.com, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: move the async flags from the serial code into the
 tty includes

On 08/21/2012 03:35 PM, Alan Cox wrote:
> From: Alan Cox <alan@...ux.intel.com>
> 
> These are used with the tty_port flags which are tty generic so move the
> flags into a more sensible place. This then makes it possible to add
> helpers such as those suggested by Huang Shijie.

Yes, the idea looks good to me. I was actually thinking of the same.

But there are two issues with this patch (see below).

> --- a/include/linux/serial.h
> +++ b/include/linux/serial.h
> @@ -15,6 +15,8 @@
>  #ifdef __KERNEL__
>  #include <asm/page.h>
>  
> +#include <linux/tty_flags.h>
> +

There are no minus lines in serial.h -- we have two copies of the flags
now? That looks insane.

The flags are a user API. You concealed them by the #include inside the
__KERNEL__ section (if I consider we do not have the flags defined twice).

And if we move the include outside of the __KERNEL__ section, we shall
update Kconfig, so that the new header is installed.

>  /*
>   * Counters of the input lines (CTS, DSR, RI, CD) interrupts
>   */
> diff --git a/include/linux/tty.h b/include/linux/tty.h
> index 69a787f..dbebd1e 100644
> --- a/include/linux/tty.h
> +++ b/include/linux/tty.h
> @@ -43,6 +43,7 @@
>  #include <linux/tty_driver.h>
>  #include <linux/tty_ldisc.h>
>  #include <linux/mutex.h>
> +#include <linux/tty_flags.h>

thanks,
-- 
js
suse labs
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