From: Jiri Slaby <jirislaby@kernel.org>
To: наб <nabijaczleweli@nabijaczleweli.xyz>
Cc: Jonathan Corbet <corbet@lwn.net>,
Federico Vaga <federico.vaga@vaga.pv.it>,
Alex Shi <alexs@kernel.org>, Yanteng Si <siyanteng@loongson.cn>,
Hu Haowen <src.res@email.cn>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc-tw-discuss@lists.sourceforge.net
Subject: Re: [PATCH 1/5] tty: remove TTY_MAGIC
Date: Fri, 16 Sep 2022 08:51:11 +0200 [thread overview]
Message-ID: <c950647b-1570-7630-4754-611c06511a8f@kernel.org> (raw)
In-Reply-To: <476d024cd6b04160a5de381ea2b9856b60088cbd.1663288066.git.nabijaczleweli@nabijaczleweli.xyz>
On 16. 09. 22, 3:54, наб wrote:
> According to Greg, in the context of magic numbers as defined in
> magic-number.rst, "the tty layer should not need this and I'll gladly
> take patches"
>
> Ref: https://lore.kernel.org/linux-doc/YyMlovoskUcHLEb7@kroah.com/
> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
What a good riddance! We have by far better debugging techniques nowadays.
Acked-by: Jiri Slaby <jirislaby@kernel.org>
> ---
> Whole series: amd64 allyesconfig builds; amd64 Debian config boots and
> appears to work; naturally, the HVC stuff is S/390 only, but it's a
> constant offset
>
> Documentation/process/magic-number.rst | 1 -
> Documentation/translations/it_IT/process/magic-number.rst | 1 -
> Documentation/translations/zh_CN/process/magic-number.rst | 1 -
> Documentation/translations/zh_TW/process/magic-number.rst | 1 -
> drivers/tty/tty_io.c | 8 --------
> drivers/tty/tty_mutex.c | 6 ------
> include/linux/tty.h | 6 ------
> 7 files changed, 24 deletions(-)
>
> diff --git a/Documentation/process/magic-number.rst b/Documentation/process/magic-number.rst
> index f5ba36e96461..b4c7ec61437e 100644
> --- a/Documentation/process/magic-number.rst
> +++ b/Documentation/process/magic-number.rst
> @@ -84,7 +84,6 @@ SLIP_MAGIC 0x5302 slip ``drivers/net/sl
> STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
> SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
> AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
> -TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h``
> MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c``
> TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h``
> MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``
> diff --git a/Documentation/translations/it_IT/process/magic-number.rst b/Documentation/translations/it_IT/process/magic-number.rst
> index f452fafb1e84..bcb23384fefd 100644
> --- a/Documentation/translations/it_IT/process/magic-number.rst
> +++ b/Documentation/translations/it_IT/process/magic-number.rst
> @@ -90,7 +90,6 @@ SLIP_MAGIC 0x5302 slip ``drivers/net/sl
> STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
> SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
> AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
> -TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h``
> MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c``
> TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h``
> MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``
> diff --git a/Documentation/translations/zh_CN/process/magic-number.rst b/Documentation/translations/zh_CN/process/magic-number.rst
> index 42f0635ca70a..6250087d36c5 100644
> --- a/Documentation/translations/zh_CN/process/magic-number.rst
> +++ b/Documentation/translations/zh_CN/process/magic-number.rst
> @@ -73,7 +73,6 @@ SLIP_MAGIC 0x5302 slip ``drivers/net/sl
> STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
> SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
> AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
> -TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h``
> MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c``
> TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h``
> MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``
> diff --git a/Documentation/translations/zh_TW/process/magic-number.rst b/Documentation/translations/zh_TW/process/magic-number.rst
> index ae321a9aaece..fd169d760bbd 100644
> --- a/Documentation/translations/zh_TW/process/magic-number.rst
> +++ b/Documentation/translations/zh_TW/process/magic-number.rst
> @@ -76,7 +76,6 @@ SLIP_MAGIC 0x5302 slip ``drivers/net/sl
> STRIP_MAGIC 0x5303 strip ``drivers/net/strip.c``
> SIXPACK_MAGIC 0x5304 sixpack ``drivers/net/hamradio/6pack.h``
> AX25_MAGIC 0x5316 ax_disp ``drivers/net/mkiss.h``
> -TTY_MAGIC 0x5401 tty_struct ``include/linux/tty.h``
> MGSL_MAGIC 0x5401 mgsl_info ``drivers/char/synclink.c``
> TTY_DRIVER_MAGIC 0x5402 tty_driver ``include/linux/tty_driver.h``
> MGSLPC_MAGIC 0x5402 mgslpc_info ``drivers/char/pcmcia/synclink_cs.c``
> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
> index 82a8855981f7..33962109bd10 100644
> --- a/drivers/tty/tty_io.c
> +++ b/drivers/tty/tty_io.c
> @@ -170,7 +170,6 @@ static void free_tty_struct(struct tty_struct *tty)
> tty_ldisc_deinit(tty);
> put_device(tty->dev);
> kvfree(tty->write_buf);
> - tty->magic = 0xDEADDEAD;
> kfree(tty);
> }
>
> @@ -265,11 +264,6 @@ static int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
> imajor(inode), iminor(inode), routine);
> return 1;
> }
> - if (tty->magic != TTY_MAGIC) {
> - pr_warn("(%d:%d): %s: bad magic number\n",
> - imajor(inode), iminor(inode), routine);
> - return 1;
> - }
> #endif
> return 0;
> }
> @@ -1533,7 +1527,6 @@ static void release_one_tty(struct work_struct *work)
> if (tty->ops->cleanup)
> tty->ops->cleanup(tty);
>
> - tty->magic = 0;
> tty_driver_kref_put(driver);
> module_put(owner);
>
> @@ -3093,7 +3086,6 @@ struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx)
> return NULL;
>
> kref_init(&tty->kref);
> - tty->magic = TTY_MAGIC;
> if (tty_ldisc_init(tty)) {
> kfree(tty);
> return NULL;
> diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
> index 393518a24cfe..784e46a0a3b1 100644
> --- a/drivers/tty/tty_mutex.c
> +++ b/drivers/tty/tty_mutex.c
> @@ -14,8 +14,6 @@
>
> void tty_lock(struct tty_struct *tty)
> {
> - if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
> - return;
> tty_kref_get(tty);
> mutex_lock(&tty->legacy_mutex);
> }
> @@ -25,8 +23,6 @@ int tty_lock_interruptible(struct tty_struct *tty)
> {
> int ret;
>
> - if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
> - return -EIO;
> tty_kref_get(tty);
> ret = mutex_lock_interruptible(&tty->legacy_mutex);
> if (ret)
> @@ -36,8 +32,6 @@ int tty_lock_interruptible(struct tty_struct *tty)
>
> void tty_unlock(struct tty_struct *tty)
> {
> - if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))
> - return;
> mutex_unlock(&tty->legacy_mutex);
> tty_kref_put(tty);
> }
> diff --git a/include/linux/tty.h b/include/linux/tty.h
> index 7b0a5d478ef6..ba65043e9029 100644
> --- a/include/linux/tty.h
> +++ b/include/linux/tty.h
> @@ -122,8 +122,6 @@ struct tty_operations;
> /**
> * struct tty_struct - state associated with a tty while open
> *
> - * @magic: magic value set early in @alloc_tty_struct to %TTY_MAGIC, for
> - * debugging purposes
> * @kref: reference counting by tty_kref_get() and tty_kref_put(), reaching zero
> * frees the structure
> * @dev: class device or %NULL (e.g. ptys, serdev)
> @@ -193,7 +191,6 @@ struct tty_operations;
> * &struct tty_port.
> */
> struct tty_struct {
> - int magic;
> struct kref kref;
> struct device *dev;
> struct tty_driver *driver;
> @@ -260,9 +257,6 @@ struct tty_file_private {
> struct list_head list;
> };
>
> -/* tty magic number */
> -#define TTY_MAGIC 0x5401
> -
> /**
> * DOC: TTY Struct Flags
> *
--
js
suse labs
next prev parent reply other threads:[~2022-09-16 6:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-16 1:54 наб
2022-09-16 1:55 ` [PATCH 2/5] tty: remove TTY_DRIVER_MAGIC наб
2022-09-16 6:51 ` Jiri Slaby
2022-09-16 1:55 ` [PATCH 3/5] tty: n_hdlc: remove HDLC_MAGIC наб
2022-09-16 6:51 ` Jiri Slaby
2022-09-16 1:55 ` [PATCH 4/5] tty: synclink_gt: remove MGSL_MAGIC наб
2022-09-16 6:52 ` Jiri Slaby
2022-09-16 1:55 ` [PATCH 5/5] tty: hvc: remove HVC_IUCV_MAGIC наб
2022-09-16 6:52 ` Jiri Slaby
2022-09-16 6:51 ` Jiri Slaby [this message]
2022-09-16 7:33 ` [PATCH 1/5] tty: remove TTY_MAGIC Theodore Ts'o
2022-09-16 8:45 ` Jiri Slaby
2022-09-22 14:12 ` Greg Kroah-Hartman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c950647b-1570-7630-4754-611c06511a8f@kernel.org \
--to=jirislaby@kernel.org \
--cc=alexs@kernel.org \
--cc=corbet@lwn.net \
--cc=federico.vaga@vaga.pv.it \
--cc=gregkh@linuxfoundation.org \
--cc=linux-doc-tw-discuss@lists.sourceforge.net \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=nabijaczleweli@nabijaczleweli.xyz \
--cc=siyanteng@loongson.cn \
--cc=src.res@email.cn \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®