From: John Ogness <john.ogness@linutronix.de>
To: Palmer Dabbelt <palmer@dabbelt.com>, namcao@linutronix.de
Cc: bigeasy@linutronix.de, tglx@linutronix.de,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
x86@kernel.org, hpa@zytor.com, aou@eecs.berkeley.edu,
bp@alien8.de, Catalin Marinas <catalin.marinas@arm.com>,
williams@redhat.com, dave.hansen@linux.intel.com,
mingo@redhat.com, Paul Walmsley <paul.walmsley@sifive.com>,
pmladek@suse.com, senozhatsky@chromium.org, rostedt@goodmis.org,
Will Deacon <will@kernel.org>
Subject: Re: [PATCH 3/3] riscv: Allow to enable PREEMPT_RT.
Date: Thu, 10 Oct 2024 11:00:57 +0206 [thread overview]
Message-ID: <844j5kmj6m.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <mhng-f0f516a0-6774-4c87-b8da-313601bad133@palmer-ri-x1c9>
On 2024-10-09, Palmer Dabbelt <palmer@dabbelt.com> wrote:
> and it breaks my boot test script. Looks like it's actually working
> mostly fine, I'm just not getting the "reboot: System halted" message
> that I'm checking for to make sure the system actually went down
> cleanly.
>
> I'm not sure if this is expected behavior in RT land, or if we've got
> some sort of bug. It sort of smells like we're losing the last printk()
> line...
For PREEMPT_RT, the console printing is done via a thread. On
shutdown/reboot, the threads are no longer active to print the final
messages. There is a new console driver type (NBCON) that is available
for this. However, currently in mainline there are no console drivers
that have been converted to NBCON yet.
I am currently working [0] to get an NBCON console driver for the 8250
uart in mainline. But that will not help your case if you are using some
other console driver.
John Ogness
[0] https://lore.kernel.org/lkml/20240913140538.221708-1-john.ogness@linutronix.de
next prev parent reply other threads:[~2024-10-10 8:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-06 10:59 [PATCH 0/3] Allow to enable PREEMPT_RT Sebastian Andrzej Siewior
2024-09-06 10:59 ` [PATCH 1/3] x86: " Sebastian Andrzej Siewior
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for Sebastian Andrzej Siewior
2024-09-17 9:15 ` tip-bot2 for Sebastian Andrzej Siewior
2024-09-06 10:59 ` [PATCH 2/3] arm64: " Sebastian Andrzej Siewior
2024-09-06 11:30 ` Will Deacon
2024-09-06 14:13 ` Steven Rostedt
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for Sebastian Andrzej Siewior
2024-09-17 9:15 ` tip-bot2 for Sebastian Andrzej Siewior
2024-09-06 10:59 ` [PATCH 3/3] riscv: " Sebastian Andrzej Siewior
2024-09-06 15:13 ` Nam Cao
2024-09-06 18:48 ` Palmer Dabbelt
2024-09-17 10:44 ` Sebastian Andrzej Siewior
2024-10-09 16:47 ` Palmer Dabbelt
2024-10-09 16:44 ` Palmer Dabbelt
2024-10-09 17:41 ` Nam Cao
2024-10-10 8:54 ` John Ogness [this message]
2024-10-10 12:21 ` Sebastian Andrzej Siewior
2024-09-09 17:27 ` [tip: sched/rt] " tip-bot2 for Sebastian Andrzej Siewior
2024-09-17 9:15 ` tip-bot2 for Sebastian Andrzej Siewior
2024-09-10 2:39 ` [PATCH 0/3] " Mingcong Bai
2024-09-12 7:14 ` Sebastian Andrzej Siewior
2024-09-30 5:09 ` Shrikanth Hegde
2024-09-30 10:22 ` Sebastian Andrzej Siewior
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