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 E0941C43458 for ; Mon, 6 Jul 2026 08:26:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B51406B00DB; Mon, 6 Jul 2026 04:26:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B02026B00E8; Mon, 6 Jul 2026 04:26:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9F12A6B00EA; Mon, 6 Jul 2026 04:26:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 736FB6B00DB for ; Mon, 6 Jul 2026 04:26:32 -0400 (EDT) Received: from smtpin06.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id E558216899A for ; Mon, 6 Jul 2026 08:26:31 +0000 (UTC) X-FDA: 84957670182.06.EF02F9D Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf28.hostedemail.com (Postfix) with ESMTP id 369CDC0007 for ; Mon, 6 Jul 2026 08:26:30 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=XD95iwxe; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf28.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1783326390; b=VVz6yXKfHfjwG/7Gg/sr8/Nbwe15/3Zy5daLuG9htB2H6Nc396j4VKi0BGp4lhoFc21PsT fOglJo7+MmXCFCn7QeFe2JwvLhR7iPRIQnZetVRN6qlk94fSNFqgDAB7jm7iPM/BXA0uWP uogm1pghH/5K1TYI5s1GEIPr6HSaqPQ= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=XD95iwxe; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf28.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1783326390; 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=tmx803utrU9SauxJqUVH2L6AoBvfeqUv4jPv6Ckgibg=; b=X5KMmKjcmqqYP16tZSOJ9oTszrM4COO5xjNE6pox84rI+cGurTY8cqtgVruy+d06HGG/14 5Juqq9qo5ZAXN2U1r+lh9G8CmN3esjmLNXXRv6+I1r8drXWcz8S3+CjFmMK41g+J3E9SYA i6Ritii1LC1ypVgevWzFjlJ/gafQ9gw= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id B005561389; Mon, 6 Jul 2026 08:26:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B1641F00A3A; Mon, 6 Jul 2026 08:26:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783326389; bh=tmx803utrU9SauxJqUVH2L6AoBvfeqUv4jPv6Ckgibg=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=XD95iwxeSuM7nYOntQkQSp1XpHvUUgRt9Mm7J9d/VkZR7E80FEFMjJDyGmJ2W3djC 9wn0A2P7kC2wbHe3hN+Njj9j1Xs6X+k6y5/jBwSCwDGLG8EHFgsrWjAB7WBPw4fvCD Y7/R+g18v+7739iD4xJ/z7uq1D9TSJUsFQm6Bqr8vkVSlGW03mizQKKqj46q/4Yy4x LnWl5QFzmJBiObpyDxm8FglWgHjaTedegyorDWXtgHodH70MpAr75sIwmgxuE5oSc9 GBkFcjXN53YsFVNITvvNvy1s1H9e7xDLx+TZjutjsIHCTen+wvEeQLP9hQtRZ4SVoh nmjH8mUphDNvQ== Message-ID: <66e478ca-1234-43b8-854f-fed4a804f4fc@kernel.org> Date: Mon, 6 Jul 2026 10:26:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 5/5] mm/page_alloc: remove set_page_private() in prep_compound_tail() To: Zi Yan , Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Mike Rapoport , Dennis Zhou , Tejun Heo , Christoph Lameter , Alistair Popple Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260703-keep-subpage-private-zero-at-free-v2-0-2970fe777dd6@nvidia.com> <20260703-keep-subpage-private-zero-at-free-v2-5-2970fe777dd6@nvidia.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: <20260703-keep-subpage-private-zero-at-free-v2-5-2970fe777dd6@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 369CDC0007 X-Rspam-User: X-Stat-Signature: sbcuzz9ymu69386wocb8r4j6f63x17r4 X-Rspamd-Server: rspam03 X-HE-Tag: 1783326390-50358 X-HE-Meta: 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 JT6By35c 9XtzLRLtPKjH+TaVXizGuNBBpd1udpB/z47yhjuSwEcxoeeWLIlMzB7+J70hUbbJx+6uW4/PcJ0FKQk2t2i71pa0k8z9RfvjaCpmES0EvkT/xbssVUSwPxOuhVywNU1yyeXY9OfeoXaCvdanvq+hpjP+kZXAtfFwxS7YEs+HCalXC1rzWqibukzlLtaWtEPorNojItxbhf22V+9c8LNZfTnPS4NCjE//ZhWo/LlD+Ny21KnwXZiO4DtHp8AnkcJjKYu1UfmtCTufGBqJb3kMdvFgtcl4wf64Q9lsBFhCh6Lfv61tn3UkuLnrASLkYnnbX9j5M87dfIEaIf1gP2SEG677lg0p4aiW02Kng Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/3/26 15:47, Zi Yan wrote: > Tail pages are expected to have (and optionally be checked) zeroed > ->private when they are freed. It stays true during subsequent > reallocation, so replace the tail_page->private initialization with a > VM_WARN_ON_ONCE() in compound page preparation. > > Acked-by: Vlastimil Babka (SUSE) > Signed-off-by: Zi Yan Acked-by: David Hildenbrand (Arm) -- Cheers, David