From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 716C0291C33; Tue, 10 Mar 2026 08:12:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773130328; cv=none; b=YDmHJujxxLDkSn2Scg4TqavZjrxK27VJiH+c/b44B9XaHql/G33HLS79SDVu5WO2vtJiKZXOMt+z4Peq5QCHznSs97hhkZFOTaDUm4bcg94+PXQnDIJ4IrIAEMqR13gkchBGocLOnz5vdk/9W/fa4ByIlWrdLbNwG9BWqiVieq4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773130328; c=relaxed/simple; bh=oUEop/YL6ktm+iMT9kaKCGei27OPHLY3n8K3k7wba54=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=hAvgoL6HiY2QA2V/cW6Woo9b7LYFzqRxzEZrTmjGL9phHVWdSNkwv1i4rY0UbRahjZhverJleLz1oqJ61o6sEQ0YLN5BzDe4A3w7jlUCrmxf2PvthYdbgzfyzVPqq3BiUr7Q8cozv8RN+DDL40ZxzDoIul8kTsRzW7Rmz5CgoQ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=N7wE/GzZ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="N7wE/GzZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 068BBC19423; Tue, 10 Mar 2026 08:12:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773130328; bh=oUEop/YL6ktm+iMT9kaKCGei27OPHLY3n8K3k7wba54=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=N7wE/GzZCAPdVdJRBH/o6VZPuXFFmhFImAWZ0DvimaZvG23jLhkH35uGibH+C900m BRD5QJMw/awxUsR5G8qWbyOcOv4icMdlzoqNLd26InNtu5xNiwuaqk4tBWpum17C+N JYyP48FEye/NMpiHPl2h3Q6tojSl6MCmqTDTRq+t2a+ddLp1bhnW6gsdaYJMa36+Do T2MO3pJYnTt/I8d2cZCVeMVOwwxpODKgNhRxK+o03B0JSdj971OUV8DFIcDmMLAbAk AW4neIzVACen7qpCSktImVAO3QBaz8nGkThxMZVx/YkDNlnAJjIsmzuDwFhOhU8zZI q6rYc9pG3tfWQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1vzsCD-00000000Kwx-2y5M; 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) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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.