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Tue, 10 Mar 2026 08:12:05 +0000 Date: Tue, 10 Mar 2026 08:12:05 +0000 Message-ID: <86fr686r3e.wl-maz@kernel.org> From: Marc Zyngier To: Waiman Long Cc: Thomas Gleixner , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH] irqchip/gic-v3-its: Don't acquire rt_spin_lock in allocate_vpe_l1_table() In-Reply-To: <0a332e19-c99e-4dc5-a2d0-b36a2aef80a1@redhat.com> References: <20260107215353.75612-1-longman@redhat.com> <864iowmrx6.wl-maz@kernel.org> <87ms2nsqju.ffs@tglx> <86wm1qlq7l.wl-maz@kernel.org> <87ecnwij44.ffs@tglx> <86v7h8l9ht.wl-maz@kernel.org> <87pl7gglya.ffs@tglx> <86tswrkrh4.wl-maz@kernel.org> <861pjjcqdi.wl-maz@kernel.org> <4dc6ab03-b2ad-4411-a49b-4513c5d592ea@redhat.com> <70dbf293-dd5b-4d77-b653-8f8c09129723@redhat.com> <0a332e19-c99e-4dc5-a2d0-b36a2aef80a1@redhat.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: longman@redhat.com, tglx@kernel.org, bigeasy@linutronix.de, clrkwllms@kernel.org, rostedt@goodmis.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260310_011208_914059_F6F07E03 X-CRM114-Status: GOOD ( 21.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 09 Mar 2026 19:06:04 +0000, Waiman Long wrote: > > On 1/21/26 10:49 PM, Waiman Long wrote: > > > > On 1/21/26 3:41 PM, Waiman Long wrote: > >> > >>>> Waiman, can you please give the following hack a go on your box? The > >>>> machines I have are thankfully limited to a single ITS group, so I > >>>> can't directly reproduce your issue. > >>> Have you managed to try this hack? I may be able to spend some time > >>> addressing the issue in the next cycle if I have an indication that > >>> I'm on the right track. > >> > >> Yes, I have tried out your hack patch and the 2-socket Grace test > >> system booted up without producing any bug report for a RT debug > >> kernel. I will try out your official patch once it come out. So > >> moving the memory allocation to a later part of the hotplug bringup > >> pipeline where sleeping is allowed should work. > > > > Attaching the dmesg log for your further investigation. > > Ping, > > Are you planning to send out an official patch soon? Soon? On a geological scale, certainly. On a more practical scale, when I get time, which hasn't happened so far in this cycle ($WORK gets, unsurprisingly, in the way of solving problems I don't have). If that's not soon enough, feel free to expand the hack I posted to include all boot-time tables. Thanks, M. -- Without deviation from the norm, progress is not possible.