From: Petr Mladek <pmladek@suse.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Doug Anderson <dianders@chromium.org>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Jason Wessel <jason.wessel@windriver.com>,
Daniel Thompson <daniel.thompson@linaro.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>,
kgdb-bugreport@lists.sourceforge.net,
linux-serial@vger.kernel.org
Subject: Re: [PATCH printk v2 12/38] tty: serial: kgdboc: use console_is_enabled()
Date: Mon, 7 Nov 2022 09:47:38 +0100 [thread overview]
Message-ID: <Y2jGKnSw02QLecx+@alley> (raw)
In-Reply-To: <87bkpm7kp8.fsf@jogness.linutronix.de>
On Fri 2022-11-04 17:29:15, John Ogness wrote:
> On 2022-10-24, Doug Anderson <dianders@chromium.org> wrote:
> > It actually only holds console_list_lock() even at the end of the
> > series. Still, it seems weird that we're declaring the `data_race` on
> > CON_ENABLED but not CON_BOOT ?
>
> For my upcoming v3 I decided to drop this patch and will keep the
> existing direct reading of @flags. Instead of this patch, for v3 the
> comment will additionally mention why @flags is allowed to be directly
> read:
>
> /*
> * Hold the console_lock to guarantee that no consoles are
^^^^^^^^^^^^
> * unregistered until the kgdboc_earlycon setup is complete.
My understanding is that this is synchronized by console_list_lock.
Or do I miss something?
> * Trapping the exit() callback relies on exit() not being
> * called until the trap is setup. This also allows safe
> * traversal of the console list and race-free reading of @flags.
> */
Best Regards,
Petr
next prev parent reply other threads:[~2022-11-07 8:47 UTC|newest]
Thread overview: 151+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-19 14:55 [PATCH printk v2 00/38] reduce console_lock scope John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-19 14:55 ` [PATCH printk v2 01/38] serial: kgdboc: Lock console list in probe function John Ogness
2022-10-19 15:41 ` Greg Kroah-Hartman
2022-10-24 5:22 ` Sergey Senozhatsky
2022-10-25 0:34 ` Doug Anderson
2022-10-19 14:55 ` [PATCH printk v2 02/38] printk: Convert console_drivers list to hlist John Ogness
2022-10-19 15:44 ` Greg Kroah-Hartman
2022-10-19 21:46 ` John Ogness
2022-10-20 7:43 ` Greg Kroah-Hartman
2022-10-20 12:36 ` Petr Mladek
2022-10-24 5:23 ` Sergey Senozhatsky
2022-10-19 14:55 ` [PATCH printk v2 03/38] printk: Prepare for SRCU console list protection John Ogness
2022-10-19 15:16 ` Miguel Ojeda
2022-10-19 17:12 ` Paul E. McKenney
2022-10-21 8:34 ` Petr Mladek
2022-10-31 13:06 ` John Ogness
2022-10-31 14:09 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 04/38] printk: introduce console_is_enabled() wrapper John Ogness
2022-10-19 16:01 ` Greg Kroah-Hartman
2022-10-21 8:57 ` Petr Mladek
2022-10-21 9:37 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 05/38] printk: use console_is_enabled() John Ogness
2022-10-21 9:25 ` Petr Mladek
2022-10-31 15:39 ` John Ogness
2022-10-19 14:55 ` [PATCH printk v2 06/38] tty: nfcon: " John Ogness
2022-10-21 9:55 ` Petr Mladek
2022-10-31 15:59 ` John Ogness
2022-11-01 8:57 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 07/38] um: kmsg_dump: " John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-21 12:46 ` Petr Mladek
2022-10-21 12:46 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 08/38] efi: earlycon: " John Ogness
2022-10-19 15:32 ` Ard Biesheuvel
2022-10-21 12:53 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 09/38] netconsole: " John Ogness
2022-10-21 13:14 ` Petr Mladek
2022-11-04 15:12 ` John Ogness
2022-10-19 14:55 ` [PATCH printk v2 10/38] tty: hvc: " John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-19 16:01 ` Greg Kroah-Hartman
2022-10-19 16:01 ` Greg Kroah-Hartman
2022-10-21 13:22 ` Petr Mladek
2022-10-21 13:22 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 11/38] tty: serial: earlycon: " John Ogness
2022-10-19 16:01 ` Greg Kroah-Hartman
2022-10-21 13:51 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 12/38] tty: serial: kgdboc: " John Ogness
2022-10-19 16:00 ` Greg Kroah-Hartman
2022-10-21 14:10 ` Petr Mladek
2022-10-24 22:46 ` Doug Anderson
2022-10-25 0:49 ` Doug Anderson
2022-10-25 11:28 ` John Ogness
2022-11-04 16:23 ` John Ogness
2022-11-07 8:47 ` Petr Mladek [this message]
2022-11-07 9:45 ` John Ogness
2022-10-19 14:55 ` [PATCH printk v2 13/38] tty: serial: pic32_uart: " John Ogness
2022-10-19 16:01 ` Greg Kroah-Hartman
2022-10-21 14:11 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 14/38] tty: serial: samsung_tty: " John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-19 16:00 ` Greg Kroah-Hartman
2022-10-19 16:00 ` Greg Kroah-Hartman
2022-10-21 14:14 ` Petr Mladek
2022-10-21 14:14 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 15/38] tty: serial: serial_core: " John Ogness
2022-10-19 16:00 ` Greg Kroah-Hartman
2022-10-21 14:14 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 16/38] tty: serial: xilinx_uartps: " John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-19 16:01 ` Greg Kroah-Hartman
2022-10-19 16:01 ` Greg Kroah-Hartman
2022-10-21 14:23 ` Petr Mladek
2022-10-21 14:23 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 17/38] tty: tty_io: " John Ogness
2022-10-19 16:00 ` Greg Kroah-Hartman
2022-10-21 14:24 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 18/38] usb: early: xhci-dbc: " John Ogness
2022-10-19 16:01 ` Greg Kroah-Hartman
2022-10-21 14:27 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 19/38] kdb: kdb_io: " John Ogness
2022-10-21 14:28 ` Petr Mladek
2022-10-25 0:34 ` Doug Anderson
2022-10-19 14:55 ` [PATCH printk v2 20/38] um: kmsg_dumper: use srcu console list iterator John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-21 14:56 ` Petr Mladek
2022-10-21 14:56 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 21/38] serial: kgdboc: " John Ogness
2022-10-19 16:02 ` Greg Kroah-Hartman
2022-10-21 15:09 ` Petr Mladek
2022-10-25 0:33 ` Doug Anderson
2022-10-19 14:55 ` [PATCH printk v2 22/38] serial: kgdboc: document console_lock usage John Ogness
2022-10-20 7:42 ` Greg Kroah-Hartman
2022-10-25 0:36 ` Doug Anderson
2022-10-25 10:09 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 23/38] tty: tty_io: " John Ogness
2022-10-20 7:43 ` Greg Kroah-Hartman
2022-10-25 13:31 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 24/38] xen: fbfront: use srcu console list iterator John Ogness
2022-10-19 14:55 ` John Ogness
2022-10-25 13:39 ` Petr Mladek
2022-10-25 13:39 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 25/38] proc: consoles: document console_lock usage John Ogness
2022-10-25 14:40 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 26/38] kdb: use srcu console list iterator John Ogness
2022-10-25 0:47 ` Doug Anderson
2022-10-25 14:59 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 27/38] printk: console_flush_all: " John Ogness
2022-10-25 15:17 ` Petr Mladek
2022-11-07 0:00 ` John Ogness
2022-11-07 13:03 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 28/38] printk: console_unblank: " John Ogness
2022-10-25 15:28 ` Petr Mladek
2022-10-25 15:31 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 29/38] printk: console_flush_on_panic: " John Ogness
2022-10-25 15:32 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 30/38] printk: console_device: " John Ogness
2022-10-25 15:35 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 31/38] printk: register_console: " John Ogness
2022-10-26 8:20 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 32/38] printk: __pr_flush: " John Ogness
2022-10-26 8:33 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 33/38] printk: introduce console_list_lock John Ogness
2022-10-20 7:53 ` Greg Kroah-Hartman
2022-10-27 10:09 ` Petr Mladek
2022-10-27 18:50 ` Paul E. McKenney
2022-10-28 18:09 ` Boqun Feng
2022-10-28 18:42 ` Paul E. McKenney
2022-11-07 10:10 ` John Ogness
2022-11-07 16:16 ` Paul E. McKenney
2022-10-19 14:55 ` [PATCH printk v2 34/38] serial: kgdboc: use console_list_lock instead of console_lock John Ogness
2022-10-20 7:52 ` Greg Kroah-Hartman
2022-10-27 10:13 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 35/38] tty: tty_io: use console_list_lock for list synchronization John Ogness
2022-10-20 7:43 ` Greg Kroah-Hartman
2022-10-27 10:17 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 36/38] proc: consoles: use console_list_lock for list iteration John Ogness
2022-10-27 12:02 ` Petr Mladek
2022-10-19 14:55 ` [PATCH printk v2 37/38] printk: relieve console_lock of list synchronization duties John Ogness
2022-10-27 12:40 ` Petr Mladek
2022-10-19 14:56 ` [PATCH printk v2 38/38] printk, xen: fbfront: create/use safe function for forcing preferred John Ogness
2022-10-19 14:56 ` John Ogness
2022-10-27 13:18 ` Petr Mladek
2022-10-27 13:18 ` Petr Mladek
2022-10-27 13:35 ` John Ogness
2022-10-27 13:35 ` John Ogness
2022-10-27 14:27 ` Petr Mladek
2022-10-27 14:27 ` Petr Mladek
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=Y2jGKnSw02QLecx+@alley \
--to=pmladek@suse.com \
--cc=daniel.thompson@linaro.org \
--cc=dianders@chromium.org \
--cc=gregkh@linuxfoundation.org \
--cc=jason.wessel@windriver.com \
--cc=jirislaby@kernel.org \
--cc=john.ogness@linutronix.de \
--cc=kgdb-bugreport@lists.sourceforge.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=rostedt@goodmis.org \
--cc=senozhatsky@chromium.org \
--cc=tglx@linutronix.de \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.