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 A3676EA7946 for ; Wed, 4 Feb 2026 20:00:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E56D96B0098; Wed, 4 Feb 2026 15:00:45 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E34566B0099; Wed, 4 Feb 2026 15:00:45 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D57576B009B; Wed, 4 Feb 2026 15:00:45 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id C33B36B0098 for ; Wed, 4 Feb 2026 15:00:45 -0500 (EST) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 87F2516025C for ; Wed, 4 Feb 2026 20:00:45 +0000 (UTC) X-FDA: 84407842050.03.FB3275F Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf02.hostedemail.com (Postfix) with ESMTP id BA04180005 for ; Wed, 4 Feb 2026 20:00:43 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=V77fOIPp; spf=pass (imf02.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1770235243; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Rx6NnBLa/5uRY3jYHFXV11DdFd23EdNAxbFo+sSPJp8=; b=7Y5shjc9NFV2IVHnKVPNmhaa4vI8ehWIAZ8ak4FHbr+znLiRAwdbHljBYY6dKDufClIExg 7tZR9YAEZfFz93D5QNnohYqtgYr98ytA+Y8KQeXzpOq+l9qypW+hBAgqOEWEE83kR+vBEl 75u5d71WbyzzwaiNF3VfP0HGykAVlb0= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=V77fOIPp; spf=pass (imf02.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1770235243; a=rsa-sha256; cv=none; b=ys6OlO5wzTxsDyOm5WH66iUwA7ErZ5TaP6A8yW2GEbCTRH0pYim4DUQAUT/eTjytISKa9J XkNDBqrt2YOTCrk3l9mECYXtkektJg3x2uPcceU4T1xf/CE9K4am9zuE1DWSG1Ry/WW+UA 3pEzyva5wheXVHroCYlYDY6/2zfnres= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 1011C600AA; Wed, 4 Feb 2026 20:00:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86F50C19425; Wed, 4 Feb 2026 20:00:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770235242; bh=tHNm7+iDyHbPJd/eg2zZb8QElfqohJCKbz7sI/dd45I=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=V77fOIPptAyQ15AIB6hddQUX35UU6lB+X9NmVYhTfGqbST5e98ns0VfCWf3teSk2s sCPl+WWN7yZM2PNVFqrKoLKEX7gKsJayNqxVfTL9PG6pQDbMrqXTj03zwaNKVxrw/I LA/CyDJX37UEq28N0fgczFbxyBYJuAuEQPEQ8loyDALzU/ee6xKdqFtSx4O1k8mUoS 9CHGXDF/eSYEAx6C3sjPLncGTKA+wdGAcOLDVZ20aqHV8VUkU+6S8jSMD6SAMYLiWt KxXMge7ysaT5dPMaTMlGGCt4NbL4wUgq8bp/76g0pTyfvKCvLhaMk5QlKn0U6GJ81w fRVYH4psjhuhQ== Message-ID: Date: Wed, 4 Feb 2026 21:00:36 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/2] mm/memory_hotplug: Add support to accept memory during hot-add To: "Pratik R. Sampat" , linux-mm@kvack.org, linux-coco@lists.linux.dev, x86@kernel.org, linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, kas@kernel.org, ardb@kernel.org, akpm@linux-foundation.org, osalvador@suse.de, thomas.lendacky@amd.com, michael.roth@amd.com References: <20260203174946.1198053-1-prsampat@amd.com> <20260203174946.1198053-2-prsampat@amd.com> From: "David Hildenbrand (arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260203174946.1198053-2-prsampat@amd.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: wwz5wfxd1mzmdai49frazrdscooqp1bd X-Rspamd-Queue-Id: BA04180005 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1770235243-571320 X-HE-Meta: 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 VCvbVRAv 7vYbA+2IFFhntB1mCKSFveX6FfSkUG9Fe0vajfYdeUjWJlKkhTBVmek3ptj33CGSaOTnxTKvcYg9vE9L6FGhSYnde9HDqkeTbJpL4Ce0jA0WVegd4SYVUb5La/WRSr/b5p39JHlWd86XGxgh0Biwv3D/jOcmCdTIyPZnJgKRZgT+OhYmijSOydCxyTGygYReuuU8oT/GTiRwIKtIJt3C8QrsH1apv2mJxse2uEP1O3YNS5knu17IR9K5k2tgzWEDQAjYxjVNBOyYBUGB4gHzPYTJ1YL2tWrmJCdUKmsotGqXU9s9EjibhP9Omjw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > #endif > > static inline bool pfn_is_unaccepted_memory(unsigned long pfn) > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index a63ec679d861..549ccfd190ee 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -1567,6 +1567,8 @@ int add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) > if (!strcmp(res->name, "System RAM")) > firmware_map_add_hotplug(start, start + size, "System RAM"); > > + accept_hotplug_memory(start, size); > + > /* device_online() will take the lock when calling online_pages() */ > mem_hotplug_done(); > I really hate that accepting (and un-accepting) hotplugged memory is different to accepting ordinary boot memory. Is there really no way we can get a reasonable implementation where we just call a generic accept_memory() and it will know what to do? -- Cheers, David