From: Doug Anderson <dianders@chromium.org>
To: Marcos Paulo de Souza <mpdesouza@suse.com>
Cc: Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
John Ogness <john.ogness@linutronix.de>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>,
Jason Wessel <jason.wessel@windriver.com>,
Daniel Thompson <danielt@kernel.org>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
Johannes Berg <johannes@sipsolutions.net>,
linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
kgdb-bugreport@lists.sourceforge.net,
linux-um@lists.infradead.org
Subject: Re: [PATCH 4/7] drivers: serial: kgdboc: Check CON_SUSPENDED instead of CON_ENABLED
Date: Mon, 9 Jun 2025 13:13:21 -0700 [thread overview]
Message-ID: <CAD=FV=XXQyZLYKoszj68ZGFDY=9-cmEUp406WeOeSBVZOHyUHw@mail.gmail.com> (raw)
In-Reply-To: <20250606-printk-cleanup-part2-v1-4-f427c743dda0@suse.com>
Hi,
On Fri, Jun 6, 2025 at 7:54 PM Marcos Paulo de Souza <mpdesouza@suse.com> wrote:
>
> All consoles found on for_each_console are registered, meaning that all of
> them are CON_ENABLED. The code tries to find an active console, so check if the
> console is not suspended instead.
>
> Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
> ---
> drivers/tty/serial/kgdboc.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
> index 85f6c5a76e0fff556f86f0d45ebc5aadf5b191e8..af6d2208b8ddb82d62f33292b006b2923583a0d2 100644
> --- a/drivers/tty/serial/kgdboc.c
> +++ b/drivers/tty/serial/kgdboc.c
> @@ -577,7 +577,8 @@ static int __init kgdboc_earlycon_init(char *opt)
> console_list_lock();
> for_each_console(con) {
> if (con->write && con->read &&
> - (con->flags & (CON_BOOT | CON_ENABLED)) &&
> + (con->flags & CON_BOOT) &&
> + ((con->flags & CON_SUSPENDED) == 0) &&
I haven't tried running the code, so I could easily be mistaken, but...
...the above doesn't seem like the correct conversion. The old expression was:
(con->flags & (CON_BOOT | CON_ENABLED))
That would evaluate to non-zero (true) if the console was _either_
"boot" or "enabled".
The new expression is is:
(con->flags & CON_BOOT) && ((con->flags & CON_SUSPENDED) == 0)
That's only true if the console is _both_ "boot" and "not suspended".
-Doug
next prev parent reply other threads:[~2025-06-09 20:13 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-07 2:53 [PATCH 0/7] printk cleanup - part 2 Marcos Paulo de Souza
2025-06-07 2:53 ` [PATCH 1/7] printk: Make console_{suspend,resume} handle CON_SUSPENDED Marcos Paulo de Souza
2025-06-12 11:46 ` Petr Mladek
2025-06-23 18:45 ` Marcos Paulo de Souza
2025-06-07 2:53 ` [PATCH 2/7] printk: Use consoles_suspended flag when suspending/resuming all consoles Marcos Paulo de Souza
2025-06-13 15:20 ` Petr Mladek
2025-06-20 14:43 ` John Ogness
2025-06-24 8:40 ` Petr Mladek
2025-06-24 11:04 ` John Ogness
2025-06-25 8:48 ` Petr Mladek
2025-06-23 18:53 ` Marcos Paulo de Souza
2025-06-07 2:53 ` [PATCH 3/7] drivers: tty: Check CON_SUSPENDED instead of CON_ENABLED Marcos Paulo de Souza
2025-06-12 11:48 ` Petr Mladek
2025-06-07 2:53 ` [PATCH 4/7] drivers: serial: kgdboc: " Marcos Paulo de Souza
2025-06-09 20:13 ` Doug Anderson [this message]
2025-06-10 20:03 ` Marcos Paulo de Souza
2025-06-10 23:18 ` Doug Anderson
2025-06-12 13:57 ` Petr Mladek
2025-06-12 23:16 ` Doug Anderson
2025-06-13 10:52 ` Petr Mladek
2025-06-13 16:44 ` Doug Anderson
2025-06-07 2:53 ` [PATCH 5/7] arch: um: kmsg_dump: Don't check for CON_ENABLED Marcos Paulo de Souza
2025-06-16 13:33 ` Petr Mladek
2025-06-20 15:45 ` John Ogness
2025-06-07 2:53 ` [PATCH 6/7] debug: kgd_io: " Marcos Paulo de Souza
2025-06-16 13:56 ` Petr Mladek
2025-06-30 0:31 ` Marcos Paulo de Souza
2025-06-07 2:53 ` [PATCH 7/7] printk: Don't check for CON_ENABLED on console_unblank Marcos Paulo de Souza
2025-06-16 14:02 ` Petr Mladek
2025-06-17 9:32 ` Geert Uytterhoeven
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