From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 CEC1D30E821; Fri, 22 May 2026 08:17:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779437861; cv=none; b=HOP0Hx3KTTcfmKclQft4QaEgB7OgDL0lb0vTNma4CTAnnu3h/Hf9lTGGgU8riE3lUL7UGtkm90Xw9Ap6dicSu8kMJCeev8ll5TNwrXtFcBEFSGYvtQAidkHCeVCLUM34dUOQu06FeKWsQo1gqKO707ii+tyzEf5mLBELH9tBccQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779437861; c=relaxed/simple; bh=TzvuwaQkaZDqHOCHcKrPqPa7+Jslw5hGuTtM+ZdX7wQ=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=RgLHnHlLnm/48PlCyeq1mlHLjDPGwGdS8v2ZFFPmN8K8b3SdLBg+mP4sOfAU6FzxZ/RcTjNC1ZHHJiQ2P8A8pnSDEUjYU+8RUeJcIkX8Req9+AfLbM4ftWPsvg/lOJ12RBfCNSaXRiVW7bUlTaEl3CBSTi0nLqsvm669TVPTpDM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=X+0l5dv3; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="X+0l5dv3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C852B1F000E9; Fri, 22 May 2026 08:17:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779437858; bh=yY/E6ZSKFGdQK7pRAN259rZ8xF0VVM9mz8KaW6BbCBw=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=X+0l5dv36uk9ZRyNgw5bYC2gHHMUvNT6ww7QJw63eSLMk0rDLJLyO5JnBIM74YZ/A E/WoPRvdiy//iXbapkurl8y+WmcA4JOPr2qxgU0VxBzHu8/T6m3I6ZTBWDgAyIIoxs ReUbEYbJ90zc+g+Qn9aqxBW6HAp2twsXazOCdbmtTVl83RW14RFJMcdFxIDY4b4fKi YUV7Kt3Ti0JnsMVhSw/DVYia1qqIlklHvizoRfY4rae1a+PU49srruqRg2Fnk8uB9t 0BvfkmC6bJIkM2DXlY5ACBjzidvIVgfSDKz8PaiuQVSEu2UxpXxBpbuhi8iEvKNjG9 2uy4/hfEUBg/w== 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 1wQL4a-000000058pm-17h3; Fri, 22 May 2026 08:17:36 +0000 Date: Fri, 22 May 2026 09:17:35 +0100 Message-ID: <861pf3x3hc.wl-maz@kernel.org> From: Marc Zyngier To: Waiman Long Cc: Thomas Gleixner , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH 2/2] irqchip/gic-v3-its: Use GFP_ATOMIC_RT gfp flag in allocate_vpe_l1_table() In-Reply-To: <20260520204628.933654-2-longman@redhat.com> References: <20260520204628.933654-1-longman@redhat.com> <20260520204628.933654-2-longman@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@linutronix.de, bigeasy@linutronix.de, clrkwllms@kernel.org, rostedt@goodmis.org, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.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 Wed, 20 May 2026 21:46:28 +0100, Waiman Long wrote: > > A longer term solution is to defer the allocation to a later stage of the > hotplug pipeline where interrupt isn't disabled. And that's what needs doing. Not papering over this in a bizarre way. I proposed a potential solution a few months back, but didn't get a chance to work on it. If you have the bandwidth, that's the way to go. But papering over this issue this way seems like a bad case of short term and unsustainable hack. Thanks, M. -- Without deviation from the norm, progress is not possible.