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From: John Ogness <john.ogness@linutronix.de>
To: Julien Grall <julien.grall@arm.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-rt-users <linux-rt-users@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Dave P Martin <Dave.Martin@arm.com>
Subject: Re: [ANNOUNCE] v5.0.3-rt1
Date: Tue, 26 Mar 2019 17:04:04 +0100	[thread overview]
Message-ID: <878sx17hcb.fsf@linutronix.de> (raw)
In-Reply-To: <28ab7caf-1ada-1c39-c2f9-cd69b2376ef8@arm.com> (Julien Grall's message of "Tue, 26 Mar 2019 10:26:31 +0000")

Hi Julien,

On 2019-03-26, Julien Grall <julien.grall@arm.com> wrote:
>>> [...]
>>> [    1.169151] 002: Serial: AMBA PL011 UART driver
>>> [    1.254891] 002: 7ff80000.uart: ttyAMA0 at MMIO 0x7ff80000 (irq = 32, base_baud = 0) is a PL011 rev3
>>> [    1.255007] 002: printk: console [ttyAMA0] enabled
>>
>> The ttyAMA drivers do not have support for atomic printing, so it is
>> not the new atomic feature that is causing the mangling. For your
>> setup, all printk console printing is being handled within a specific
>> context, the printk kernel thread.
>
> This series is somehow making worst when using ttyAMA0. I haven't see
> any mangling with 4.19-rt.

I will setup some tests using systemd on 4.19 and 5.0 to see if I can
see what is going on. It seems there may be some synchronization missing
between the printk kernel thread and /dev/console.

John Ogness

  reply	other threads:[~2019-03-26 16:04 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-20 17:15 Sebastian Andrzej Siewior
2019-03-22 18:52 ` Julien Grall
2019-03-25  8:13   ` John Ogness
2019-03-25 10:18     ` Julien Grall
2019-03-25 10:34       ` John Ogness
2019-03-26 10:26         ` Julien Grall
2019-03-26 16:04           ` John Ogness [this message]
2019-03-27 18:33 ` [PATCH 1/4] printk: An all-in-one commit to fix build failures Sebastian Andrzej Siewior
2019-03-27 18:33   ` [PATCH 2/4] powerpc/stackprotector: work around stack-guard init from atomic Sebastian Andrzej Siewior
2019-05-10 21:46     ` Steven Rostedt
2019-03-27 18:33   ` [PATCH 3/4] powerpc/pseries/iommu: Use a locallock instead local_irq_save() Sebastian Andrzej Siewior
2019-03-27 18:33   ` [PATCH 4/4] powerpc: reshuffle TIF bits Sebastian Andrzej Siewior

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