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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 827ECF34C42 for ; Mon, 13 Apr 2026 11:48:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=evhBVSjuTjhT8AZO7ALqiR4oNX8BYOQjZt5OTWr3Ezw=; b=lZ2NbWmbdn02D4yMgh3qZxHiwI 6qCDGmAwgOwdOLgWX24Pjs4fCsAWKE3EO4fpM+twnvTsqcCFhC/q3xbGlCzcwZp2DcgBd+D2tM5/W 3aUE9KQJKQXmMvbhmOQ4uuQmOS0DdAr7fGie9v0ptesan8wa0nCf+f68Hzl5VYl0qP7fKlymUZ0t5 g9Ujr7UOMHC2ddr9ZPS2efArb1LA1sEHqjoDgd72KCJ1/0l/zL+lBK9k88gMONb8XmFyYTU7bxT7Y z2/z5sLIl0tAbLbs+g+olc2Sy5O/MAk14KUmONoZRPWIqGxYoSLoNVxl4qjAKCVl1bSdnIwFEhRsa /uD/CJVA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCFlx-0000000FbVq-2FBm; Mon, 13 Apr 2026 11:48:09 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCFlu-0000000FbU3-43UN for linux-arm-kernel@lists.infradead.org; Mon, 13 Apr 2026 11:48:08 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 56251357A; Mon, 13 Apr 2026 04:47:58 -0700 (PDT) Received: from [10.57.62.88] (unknown [10.57.62.88]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 01B053F93E; Mon, 13 Apr 2026 04:48:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1776080884; bh=evhBVSjuTjhT8AZO7ALqiR4oNX8BYOQjZt5OTWr3Ezw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=YaWnVFBrwC0Eg04p77bwiv1keGMJvUXOueR4q8XLZcsWqZXhBry1x/GeYZa16HucH zhSFjRx9tRhig59WdPy5jvMsxPmGXxymsq9WK5jH4c4NMDp9yVkSTou4Ay4RS+L85m lDGalKbe2j/0CSWqrscuyR92t3mwl1Cqe7Czc9Zc= Message-ID: <9e47d3a9-e1ae-480b-a202-54d9d72479a2@arm.com> Date: Mon, 13 Apr 2026 13:47:59 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/3] arm64: mm: Fix rodata=full block mapping support for realm guests To: Ryan Roberts , Catalin Marinas , Will Deacon , "David Hildenbrand (Arm)" , Dev Jain , Yang Shi , Suzuki K Poulose , Jinjiang Tu Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260330161705.3349825-1-ryan.roberts@arm.com> <20260330161705.3349825-2-ryan.roberts@arm.com> From: Kevin Brodsky Content-Language: en-GB In-Reply-To: <20260330161705.3349825-2-ryan.roberts@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260413_044807_144031_6B4AA282 X-CRM114-Status: UNSURE ( 6.87 ) X-CRM114-Notice: Please train this message. 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 30/03/2026 18:17, Ryan Roberts wrote: > +bool page_alloc_available __ro_after_init; > + > +void __init mem_init(void) > +{ > + page_alloc_available = true; I knew I had seen a simpler solution to this: vmemmap_alloc_block() uses slab_is_available() to tell whether the buddy allocator is available. AFAICT this becomes true somewhere in kmem_cache_init(), which is called just after mem_init(). Probably good enough for our purpose? - Kevin > + swiotlb_update_mem_attributes(); > +}