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Wed, 26 Nov 2025 01:22:45 -0800 (PST) Date: Wed, 26 Nov 2025 10:22:42 +0100 From: Petr Mladek To: Derek Barbosa Cc: John Ogness , Sergey Senozhatsky , Steven Rostedt , Sherry Sun , Jacky Bai , Jon Hunter , Thierry Reding , linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH printk v2 2/2] printk: Avoid scheduling irq_work on suspend Message-ID: References: <20251113160351.113031-1-john.ogness@linutronix.de> <20251113160351.113031-3-john.ogness@linutronix.de> <874iqxlv4e.fsf@jogness.linutronix.de> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue 2025-11-25 14:24:55, Derek Barbosa wrote: > 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. No problem at all. > Testing this patch series atop of Linus' tree resolves the suspend issue seen on > these large CPU workstation systems. Thanks a lot for checking the patches. It is great to know that it resolved the problem. > I see this has already landed in the maintainers tree at printk/linux.git. Yes, I wanted to have it in linux-next in time before the merge window opens for 6.19 (likely next week). Best Regards, Petr