From: Petr Mladek <pmladek@suse.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
Steven Rostedt <rostedt@goodmis.org>,
Juri Lelli <juri.lelli@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH linux-next] printk: nbcon: Fix nbcon_cpu_emergency_flush() when preemptible
Date: Wed, 5 Jun 2024 18:59:49 +0200 [thread overview]
Message-ID: <ZmCZhcmrVcwpZyYe@pathway.suse.cz> (raw)
In-Reply-To: <87zfrzvhsp.fsf@jogness.linutronix.de>
On Wed 2024-06-05 11:57:34, John Ogness wrote:
> nbcon_cpu_emergency_flush() can be called in a preemptible
> context. In that case the CPU is not in an emergency state.
> However, in order to see that the CPU is not in an emergency
> state (accessing the per-cpu variable), preemption must be
> disabled.
>
> Disable preemption when checking the CPU state.
>
> Reported-by: Juri Lelli <juri.lelli@redhat.com>
> Closes: https://lore.kernel.org/aqkcpca4vgadxc3yzcu74xwq3grslj5m43f3eb5fcs23yo2gy4@gcsnqcts5tos
> Fixes: 46a1379208b7 ("printk: nbcon: Implement emergency sections")
> Signed-off-by: John Ogness <john.ogness@linutronix.de>
JFYI, the patch has been comitted into printk/linux.git,
branch rework/write-atomic.
Best Regards,
Petr
prev parent reply other threads:[~2024-06-05 17:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-05 9:51 [PATCH linux-next] printk: nbcon: Fix nbcon_cpu_emergency_flush() when preemptible John Ogness
2024-06-05 10:10 ` Petr Mladek
2024-06-05 10:14 ` Petr Mladek
2024-06-05 12:15 ` Juri Lelli
2024-06-05 16:59 ` Petr Mladek [this message]
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=ZmCZhcmrVcwpZyYe@pathway.suse.cz \
--to=pmladek@suse.com \
--cc=john.ogness@linutronix.de \
--cc=juri.lelli@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=rostedt@goodmis.org \
--cc=senozhatsky@chromium.org \
/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