From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C00C5CD5BAC for ; Fri, 22 May 2026 09:06:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 347F16B0098; Fri, 22 May 2026 05:06:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 31F426B0099; Fri, 22 May 2026 05:06:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 25C9C6B009B; Fri, 22 May 2026 05:06:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 150EF6B0098 for ; Fri, 22 May 2026 05:06:54 -0400 (EDT) Received: from smtpin03.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay08.hostedemail.com (Postfix) with ESMTP id DA0C61408F5 for ; Fri, 22 May 2026 09:06:53 +0000 (UTC) X-FDA: 84794475906.03.9AF8A46 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf16.hostedemail.com (Postfix) with ESMTP id 4569618000A for ; Fri, 22 May 2026 09:06:52 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=AHh9Mvku; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf16.hostedemail.com: domain of ljs@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=ljs@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1779440812; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=3c05gl0H/GpWSA6qaxgxfypMYcQADyQffOHZBAKPcvc=; b=Yq6j4yJi1l6W716dH3z12UuKHT9G6x5rdcT/cR1qW8KOCR8KFs0qWTLj510lSwqgoA3j7g w/oONNOY83gR4hxSv8QDVBY5SniqvxD5+7eqiSpmxP9amzNldwLLPaxWoLS8YrY2vMkhsB ML5tEjeqpGGdcNLbpd3EH+whT/VrohA= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=AHh9Mvku; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf16.hostedemail.com: domain of ljs@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=ljs@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1779440812; a=rsa-sha256; cv=none; b=N8bp6231ex4cpIGqhWXR7cvKkVeNzAsEswwIEVM01U9ml78UXOZZW4q+9uDo/HZqLS/v+Q gwyObkjp64bsHp1ZpO7KMT0GtAcPfHgyQohPyi6yCecqDFCECqh4mrIj2InKmvl/6vzrCw jJ5GryQkobyHvqi3mfVETZtB3ORBEEs= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id D6DBB60136; Fri, 22 May 2026 09:06:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 701E21F0155D; Fri, 22 May 2026 09:06:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779440809; bh=3c05gl0H/GpWSA6qaxgxfypMYcQADyQffOHZBAKPcvc=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=AHh9Mvku4Tnd8U5EQXKfG07xtqXD/gmOXK6xZTxiIvJAiMFkn1FNVmOhV3MWPz75/ IV9zCMOtUNQoilLVACbSZK+6EbGvqrV5e1yPfiLurnr2w835AOHAnwWn2FeYnpdyPC fhxUWLFapRiDSRH2XCyrWgKKh58W3k075AIgm7/R4TgvNhK5wwhclvtlNGngiQjS3a 8cPy7dmRejgOL+ZiWJjl6IzW4cEoNz5h+OsGrMMS+AA8hglPmkdWuQ+LPZzi5AbFJI epMFfBExLfqLf6f4l8USRqpiRmVtZyXHsW2kjK3jYOy5jDOEQO77z5X28B5fJPEHYd LKQBvrIrMTVsw== Date: Fri, 22 May 2026 10:06:42 +0100 From: Lorenzo Stoakes To: Marc Zyngier Cc: Waiman Long , Thomas Gleixner , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , Andrew Morton , David Hildenbrand , "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() Message-ID: References: <20260520204628.933654-1-longman@redhat.com> <20260520204628.933654-2-longman@redhat.com> <861pf3x3hc.wl-maz@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <861pf3x3hc.wl-maz@kernel.org> X-Stat-Signature: 96gwfejguh878rxsbwqeg133qgn5f8qe X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 4569618000A X-Rspam-User: X-HE-Tag: 1779440812-195280 X-HE-Meta: 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 5NXSHali p7xTa3UFReQ7fJk812wmGEMGC3AXdsEqe+ukRGK5WydGI0qHJEa1JB4BCJVuqzIyy4zDku5IH99/77krzmC/ReSTKdScqL1isfUSffaSRcyOfGEJ7dI/Vo9HmmouThTJy8jcNxMiLjVp+TN5rSAbdXXVKvHScJrM3tHmdKeZ0ikrnOkwzde9S5k2OeUwXELLOHQUmpc02RJ0CtSwJPXF/oCr5Avx5zQO4s0qoRci019MZfdGlnrxaEFtAT1HaoK1G4SLdQGunB6k09MPEZTRy4sODQ6Pn5wafsNoWAwg5Mjakp4fXRKVZcgWfhWfXdzK5VUeU Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, May 22, 2026 at 09:17:35AM +0100, Marc Zyngier wrote: > 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. Yes, agreed. It really smacks of trying the fix the problem at the wrong level of abstraction. > > Thanks, > > M. > > -- > Without deviation from the norm, progress is not possible. Cheers, Lorenzo