linux-kernel - Re: [PATCH printk v2 2/2] printk: Avoid scheduling irq

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Message-ID: <bcooiesgor2qs6l44xotc6h4f4b5ktoodvuuapgsmpmlxb7sav@5xn5qh5csem2>
Date: Tue, 25 Nov 2025 14:24:55 -0500
From: Derek Barbosa <debarbos@...hat.com>
To: John Ogness <john.ogness@...utronix.de>, 
	Petr Mladek <pmladek@...e.com>, Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Steven Rostedt <rostedt@...dmis.org>, Sherry Sun <sherry.sun@....com>, Jacky Bai <ping.bai@....com>, 
	Jon Hunter <jonathanh@...dia.com>, Thierry Reding <thierry.reding@...il.com>, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH printk v2 2/2] printk: Avoid scheduling irq_work on
 suspend

On Thu, Nov 13, 2025 at 02:15:09PM -0500, Derek Barbosa wrote:
> Hi John,
> 
> On Thu, Nov 13, 2025 at 06:12:57PM +0106, John Ogness wrote:
> > 
> > I assume the problem you are seeing is with the PREEMPT_RT patches
> > applied (i.e. with the 8250-NBCON included). If that is the case, note
> > that recent versions of the 8250 driver introduce its own irq_work that
> > is also problematic. I am currently reworking the 8250-NBCON series so
> > that it does not introduce irq_work.
> > 


Hi John,

Apologies for the late reply here. Just now got some results in.

Testing this patch series atop of Linus' tree resolves the suspend issue seen on
these large CPU workstation systems.

I see this has already landed in the maintainers tree at printk/linux.git.


Cheers,

-- 
Derek <debarbos@...hat.com>