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 92260C982D8 for ; Fri, 18 Sep 2026 21:43:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9AC4F6B0098; Fri, 18 Sep 2026 17:43:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 95C146B0099; Fri, 18 Sep 2026 17:43:53 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 84C2D6B009B; Fri, 18 Sep 2026 17:43:53 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 5628A6B0098 for ; Fri, 18 Sep 2026 17:43:53 -0400 (EDT) Received: from smtpin21.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id EEED0A07FA for ; Fri, 18 Sep 2026 21:43:52 +0000 (UTC) X-FDA: 85228210704.21.BA219FC Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf22.hostedemail.com (Postfix) with ESMTP id 2F70BC0006 for ; Fri, 18 Sep 2026 21:43:51 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=dbh9lqzj; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf22.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1789767831; b=Czft7GHnw6MnH01emwpVnxvDL7VGcym6d7R1CscjZod9yLqEfH+A8zOhhHBAjLPJrzbZTh j62IrtqKwNP66BrcAmRO1kNqtDAoGBALdsl0QuSolCIoSUz2lZyqL27zAdHXItUnqlRktX WKfWehQwwijYJ4taFkzU5SuTRm9Wk1w= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=dbh9lqzj; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf22.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 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=1789767831; 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=pyzwFKPJourgRKTcGFA3EWni7XkDQAYvyS2x3+CNIrU=; b=UcBY7kaEsah+CkNFJnkaOO8NuuAA2i7IhCa7CpaRsyzN4eW9oOSTYR4Getr3sySQa8piiX z/866xpG2AAHpt/AtG3Ztj7X71fxOB2LKTAA8nuGXKEg94G5zppZL6q6EYX4k3ikdzDMkG +d8wMlq2SHtf70pwzXlYO+5nA97WbE0= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 5B95D43352; Fri, 18 Sep 2026 21:43:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBBCA1F000FF; Fri, 18 Sep 2026 21:43:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789767830; bh=pyzwFKPJourgRKTcGFA3EWni7XkDQAYvyS2x3+CNIrU=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=dbh9lqzjyuPXUx36JmC4YeTrWPPZZXDxvb5p7cPu5iGXZQXq/FGsDmKIEqgYF4y3m lxFg0pkcL5SiGKtmMeJENal6UQhw1bRA5D7lKDoDxr7wFeaCyLsRl87EIwL+Kw9vah orKjKBTIIXdkgQ4xU12+8xoBddCbjppv9y/R9Peex1utE7RIE0yvFaETnYnobGH3PI nX56coSlc2B1nlce36AeASlcUd4E7y8yGdGuH61xy2SUnPuvoyA0IyIffmUEFk1zo3 +xB7sL7Ax5eItSNcXX+bsvC9nL3JeBVocjOPomO3GYXgDhbQkWfsMGfaoNFrsG/K0+ tgpQ2vAKSbllw== Message-ID: <0df7e349-9d11-461f-8b8b-68bbddbe1f3d@kernel.org> Date: Fri, 18 Sep 2026 23:43:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RESEND v7 07/29] x86: mm: add PMD swap-exclusive helpers To: Usama Arif , Andrew Morton , chrisl@kernel.org, kasong@tencent.com, ljs@kernel.org, ziy@nvidia.com, linux-mm@kvack.org Cc: ying.huang@linux.alibaba.com, Baoquan He , willy@infradead.org, youngjun.park@lge.com, hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, alex@ghiti.fr, kas@kernel.org, baohua@kernel.org, dev.jain@arm.com, baolin.wang@linux.alibaba.com, Nico Pache , "Liam R. Howlett" , ryan.roberts@arm.com, Vlastimil Babka , lance.yang@linux.dev, linux-kernel@vger.kernel.org, nphamcs@gmail.com, shikemeng@huaweicloud.com, yosry@kernel.org, qi.zheng@linux.dev, luizcap@redhat.com, kernel-team@meta.com, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org References: <20260914122950.3283997-1-usama.arif@linux.dev> <20260914122950.3283997-8-usama.arif@linux.dev> 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: <20260914122950.3283997-8-usama.arif@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 2F70BC0006 X-Stat-Signature: gbcymf9d33kfp8b8p3if5fdc6sqxj75f X-HE-Tag: 1789767831-989156 X-HE-Meta: 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 4IMV93AN SODPdv1a2DqfIKk4qWLc+gj36z/asov9ZKgMPXHjb92i0vNPNX5AHg40UkIrfWUHjE2ae3F3JJZCMAVJeExcxvCIpXDDa0HyTPDswsYlNdReby3lalnsEKTdL39hMMyTPEhIUxpsNDEfasKdbPwZujBLK72qIj0qjjsSonSnpyT8vMNuCperAPSkkNEcD9astc/mLF97KuFR8WvKhuXxChmMO9Crp4VBbbF6rMCtMk5QmpP+CvNtX/JlXSyaDyGrb7Zhx3XoeYFiTUo8ttHr+Qe6mdRRXxIHWlpEjnaPxo9ng0QvNbeRwR3nX1xKoAfEw1LR4DWrNHX/YCCY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/14/26 14:27, Usama Arif wrote: > A later patch keeps a PMD-mapped anonymous THP mapped by a PMD across the As a general note, we try not to talk about "this patch" or "later patches". Instead, just say "Prepare for X by doing Y.". > swap round-trip, so PG_anon_exclusive now has to survive in a swap PMD and > not just in a swap PTE. > > x86-64 encodes a swap PMD exactly like a swap PTE, so the new helpers reuse > _PAGE_SWP_EXCLUSIVE, bit 3, which the swap-entry layout already reserves > for PG_anon_exclusive. 32-bit x86 aliases that bit to _PAGE_PSE and does > not select ARCH_HAS_PMD_SOFTLEAVES. > > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: Borislav Petkov > Cc: Dave Hansen > Cc: x86@kernel.org > Signed-off-by: Usama Arif > --- > arch/x86/include/asm/pgtable.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h > index d551120a7c889..a2d1cd03cba23 100644 > --- a/arch/x86/include/asm/pgtable.h > +++ b/arch/x86/include/asm/pgtable.h > @@ -1525,6 +1525,23 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) > return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE); > } > > +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES > +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) > +{ > + return pmd_set_flags(pmd, _PAGE_SWP_EXCLUSIVE); > +} > + > +static inline bool pmd_swp_exclusive(pmd_t pmd) > +{ > + return pmd_flags(pmd) & _PAGE_SWP_EXCLUSIVE; > +} > + > +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) > +{ > + return pmd_clear_flags(pmd, _PAGE_SWP_EXCLUSIVE); > +} > +#endif > + > #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY > static inline pte_t pte_swp_mksoft_dirty(pte_t pte) > { Reviewed-by: David Hildenbrand (Arm) -- Cheers, David