linux-kernel - Re: [PATCH v2 9/9] tty: Use test

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Date:	Thu, 28 Jan 2016 14:13:29 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v2 9/9] tty: Use test_bit() with tty->flags

On Sun, Jan 10, 2016 at 08:36:16PM -0800, Peter Hurley wrote:
> tty->flags are handled with atomic bit ops; use test_bit() treewide.
> 
> Signed-off-by: Peter Hurley <peter@...leysoftware.com>
> ---
>  arch/ia64/hp/sim/simserial.c       | 2 +-
>  drivers/char/pcmcia/synclink_cs.c  | 2 +-
>  drivers/isdn/i4l/isdn_tty.c        | 6 +++---
>  drivers/s390/char/tty3270.c        | 4 ++--
>  drivers/staging/dgap/dgap.c        | 2 +-
>  drivers/staging/dgnc/dgnc_tty.c    | 2 +-
>  drivers/tty/amiserial.c            | 6 +++---
>  drivers/tty/serial/68328serial.c   | 2 +-
>  drivers/tty/serial/crisv10.c       | 4 ++--
>  drivers/tty/serial/serial_core.c   | 6 +++---
>  drivers/tty/synclink.c             | 4 ++--
>  drivers/tty/synclink_gt.c          | 4 ++--
>  drivers/tty/synclinkmp.c           | 4 ++--
>  drivers/tty/tty_port.c             | 2 +-
>  net/irda/ircomm/ircomm_tty_ioctl.c | 6 +++---
>  15 files changed, 28 insertions(+), 28 deletions(-)
> 
> diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
> index e70cade..2ab9ba6 100644
> --- a/arch/ia64/hp/sim/simserial.c
> +++ b/arch/ia64/hp/sim/simserial.c
> @@ -300,7 +300,7 @@ static int rs_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
>  	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
>  	    (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
>  	    (cmd != TIOCMIWAIT)) {
> -		if (tty->flags & (1 << TTY_IO_ERROR))
> +		if (test_bit(TTY_IO_ERROR, &tty->flags))

I thought you were going to wrap these up in a tty_*() macro instead of
open-coding it everywhere?  That way you can change how those
bits/features are represented in the future, which is what I thought you
wanted to do?

Even if you don't want to do that, something like:

static inline int tty_is_io_error(struct tty_struct *tty)
{
	return test_bit(TTY_IO_ERROR, &tty->flags);
}

and then this patch would just be:
		if (tty_is_io_error(tty))

Or something like that, I'm not sold on the name, I'm sure you can pick
a better one :)

Sound reasonable?

I'll not apply this patch in the series for now.

thanks,

greg k-h