linux-kernel - Re: [PATCH 27/36] tty: propagate u8 data to tty

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Date:   Fri, 11 Aug 2023 13:52:36 +0200
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Cc:     gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Vaibhav Gupta <vaibhavgupta40@...il.com>,
        Jens Taprogge <jens.taprogge@...rogge.org>,
        Karsten Keil <isdn@...ux-pingi.de>,
        Scott Branden <scott.branden@...adcom.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        David Lin <dtwlin@...il.com>, Johan Hovold <johan@...nel.org>,
        Alex Elder <elder@...nel.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Jiri Kosina <jikos@...nel.org>,
        David Sterba <dsterba@...e.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
        Oliver Neukum <oneukum@...e.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>
Subject: Re: [PATCH 27/36] tty: propagate u8 data to tty_operations::write()

On Thu, Aug 10, 2023 at 11:15:01AM +0200, Jiri Slaby (SUSE) wrote:

Hi Jiri,

> Data are now typed as u8. Propagate this change to
> tty_operations::write().
...
>  drivers/s390/char/con3215.c            | 3 +--
>  drivers/s390/char/con3270.c            | 3 +--
>  drivers/s390/char/sclp_tty.c           | 2 +-
>  drivers/s390/char/sclp_vt220.c         | 2 +-
...
> diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
> index a1fef666c9b0..16b6f430dfd3 100644
> --- a/drivers/s390/char/con3215.c
> +++ b/drivers/s390/char/con3215.c
> @@ -1021,8 +1021,7 @@ static unsigned int tty3215_write_room(struct tty_struct *tty)
>  /*
>   * String write routine for 3215 ttys
>   */
> -static int tty3215_write(struct tty_struct *tty,
> -			 const unsigned char *buf, int count)
> +static int tty3215_write(struct tty_struct *tty, const u8 *buf, int count)
>  {
>  	handle_write(tty->driver_data, buf, count);
>  	return count;
> diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
> index d9983550062d..123524bff734 100644
> --- a/drivers/s390/char/con3270.c
> +++ b/drivers/s390/char/con3270.c
> @@ -1803,8 +1803,7 @@ static void tty3270_do_write(struct tty3270 *tp, struct tty_struct *tty,
>  /*
>   * String write routine for 3270 ttys
>   */
> -static int tty3270_write(struct tty_struct *tty,
> -			 const unsigned char *buf, int count)
> +static int tty3270_write(struct tty_struct *tty, const u8 *buf, int count)
>  {
>  	struct tty3270 *tp;
>  
> diff --git a/drivers/s390/char/sclp_tty.c b/drivers/s390/char/sclp_tty.c
> index 971fbb52740b..cc0f6a97124e 100644
> --- a/drivers/s390/char/sclp_tty.c
> +++ b/drivers/s390/char/sclp_tty.c
> @@ -230,7 +230,7 @@ static int sclp_tty_write_string(const unsigned char *str, int count, int may_fa
>   * routine will return the number of characters actually accepted for writing.
>   */
>  static int
> -sclp_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
> +sclp_tty_write(struct tty_struct *tty, const u8 *buf, int count)
>  {
>  	if (sclp_tty_chars_count > 0) {
>  		sclp_tty_write_string(sclp_tty_chars, sclp_tty_chars_count, 0);
> diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c
> index a32f34a1c6d2..44974d801c1e 100644
> --- a/drivers/s390/char/sclp_vt220.c
> +++ b/drivers/s390/char/sclp_vt220.c
> @@ -463,7 +463,7 @@ __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule,
>   * number of characters actually accepted for writing.
>   */
>  static int
> -sclp_vt220_write(struct tty_struct *tty, const unsigned char *buf, int count)
> +sclp_vt220_write(struct tty_struct *tty, const u8 *buf, int count)
>  {
>  	return __sclp_vt220_write(buf, count, 1, 0, 1);
>  }
...

In this and following patch it is only ::write() (and other) callbacks
switched to u8, while the called internal functions stay with old types.

Do you plan to follow with part II etc, or it is archs/drivers that
are expected to sort it out eventually?

(I speak for s390, but the other affected archs are in the same boat I guess).

Thanks!