From: Petr Mladek <pmladek@suse.com>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
John Ogness <john.ogness@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Guenter Roeck <linux@roeck-us.net>,
Shreyas Joshi <shreyas.joshi@biamp.com>,
shreyasjoshi15@gmail.com,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
linux-kernel@vger.kernel.org, Petr Mladek <pmladek@suse.com>
Subject: [PATCH 0/2] printk/console: Use ttynull when no console is available or wanted
Date: Wed, 11 Nov 2020 14:54:48 +0100 [thread overview]
Message-ID: <20201111135450.11214-1-pmladek@suse.com> (raw)
This is another attempt to solve regression caused by the commit
48021f98130880dd74 ("printk: handle blank console arguments passed in.").
It prevented a crash caused by empty console= parameter. But it caused
performance problems on Chromebooks because they use it to disable
all consoles, see
see https://lore.kernel.org/r/20201006025935.GA597@jagdpanzerIV.localdomain
Solve both problems by using ttynull console driver that was crated
exactly for this purpose.
The 1st patch should prevent the crash for any invalid console name.
The 2nd patch allows to used the ttynull driver also with the widely
used console= and console=null parameters.
Best Regards,
Petr
Petr Mladek (2):
init/console: Use ttynull as a fallback when there is no console
printk/console: Allow to disable console output by using console="" or
console=null
drivers/tty/Kconfig | 14 --------------
drivers/tty/Makefile | 3 +--
drivers/tty/ttynull.c | 18 ++++++++++++++++++
include/linux/console.h | 3 +++
init/main.c | 10 ++++++++--
kernel/printk/printk.c | 9 ++++++++-
6 files changed, 38 insertions(+), 19 deletions(-)
--
2.26.2
next reply other threads:[~2020-11-11 13:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-11 13:54 Petr Mladek [this message]
2020-11-11 13:54 ` [PATCH 1/2] init/console: Use ttynull as a fallback when there is no console Petr Mladek
2020-11-11 16:36 ` Greg Kroah-Hartman
2020-11-11 22:52 ` Guenter Roeck
2020-11-11 23:58 ` Sergey Senozhatsky
2020-11-12 0:17 ` Sergey Senozhatsky
2020-11-12 1:45 ` Sergey Senozhatsky
2020-11-16 16:20 ` Petr Mladek
2021-01-06 23:36 ` ARC no console output (was Re: [PATCH 1/2] init/console: Use ttynull as a fallback when there is no console) Vineet Gupta
2021-01-07 9:02 ` John Ogness
2021-01-07 13:14 ` Greg Ungerer
2021-01-07 16:43 ` Vineet Gupta
2021-01-07 17:04 ` Petr Mladek
2021-01-07 17:58 ` Vineet Gupta
2021-01-08 3:48 ` Sergey Senozhatsky
2021-01-08 5:18 ` Vineet Gupta
2021-01-08 9:30 ` Petr Mladek
2021-01-13 22:07 ` Peter Korsgaard
2021-01-07 9:09 ` Richard Weinberger
2021-01-07 12:48 ` Petr Mladek
2021-01-07 15:27 ` [Buildroot] " Yann E. MORIN
2020-11-11 13:54 ` [PATCH 2/2] printk/console: Allow to disable console output by using console="" or console=null Petr Mladek
2020-11-11 22:52 ` Guenter Roeck
2020-11-11 23:59 ` Sergey Senozhatsky
2020-11-20 14:24 ` [PATCH 0/2] printk/console: Use ttynull when no console is available or wanted Petr Mladek
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