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 83001F4198C for ; Wed, 15 Apr 2026 10:38:48 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EA82B6B0093; Wed, 15 Apr 2026 06:38:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E7F836B0095; Wed, 15 Apr 2026 06:38:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D957F6B0096; Wed, 15 Apr 2026 06:38:47 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id CC5D36B0093 for ; Wed, 15 Apr 2026 06:38:47 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 7DCC2E3EDD for ; Wed, 15 Apr 2026 10:38:47 +0000 (UTC) X-FDA: 84660441894.13.83861F8 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf09.hostedemail.com (Postfix) with ESMTP id C8381140009 for ; Wed, 15 Apr 2026 10:38:45 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=kZLIyAbB; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf09.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1776249525; a=rsa-sha256; cv=none; b=THfADEfMsXyz2RIOqSOPGBFtDcRFO8nCOpRKIewWGGI+7mBsXsYK5sj7d9h9L0d3Mc+vQf exajH89RWxjbPM8ndMXmPpDYhbUPpUutRVZEC1PhfC3Otwig1XVRdV2rP/Jd/yNgStqxUL r94aRxhpVem5Due9cA/1xSvHjJ31DsQ= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=kZLIyAbB; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf09.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=1776249525; 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=AzugdfaOWv0mpiqwtW8ZXjy66zEjkhjnQ3wMX2aWyrM=; b=n5oZ5VQ7/WtxFYJgZCKgk03kg2bOXXf9py2zOf9tAALMmiZ9wuSTZ/ghO3yoN0KZkTrWZB NmtZlBkpGp/vi3qRr9f+yRpPyMB9wJES87dLrJb711mtliIEY4RFNuzho37lmkKLTsbEcd MrXGcPp3e2ffMH1T9Hu5DziMSH6h3Pc= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 523D2600AD; Wed, 15 Apr 2026 10:38:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB067C2BCB3; Wed, 15 Apr 2026 10:38:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776249525; bh=qCE51tFTa1BLfSxOaRiThiT09pL3zMpL8+i20K7u+bo=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=kZLIyAbBtz7vnZrkuoI+3ia2GC3PxiBHPzLFHBr6Tn100ovNNWLEylPCJVT1Iboit /S65KwvbpDLKyaZXwfwrDhsE1w7xFkeigtzIGZjfRs0Vp5/4vUJwJ8p0ySZHZN8JDB R2EW5eskfszLPx7vY0DfArpVM/0hObfZxKzMP+5+hTxexeglU51gubR8rCDIHO5Ai9 aIvqSyQ9MQAvFBOiqDK4r8XNUmL48x+L/v5QNYX7Ic7w+Rp4vWPt14E8FsdudIYVmN z6h5EdVg0sMQtlrBrHicjqtlhY9vANDD8vwAPuqDNlEZ2q3JJVrHvT2oF+/y+f6NYr 7m412mIgcOJhA== Message-ID: <10dd6ea4-8da5-41bb-88ea-c6a4a976a6c9@kernel.org> Date: Wed, 15 Apr 2026 12:38:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC V1 11/16] arm64/mm: Route all pgtable atomics to central helpers To: Anshuman Khandual , linux-arm-kernel@lists.infradead.org Cc: Catalin Marinas , Will Deacon , Ryan Roberts , Mark Rutland , Lorenzo Stoakes , Andrew Morton , Mike Rapoport , Linu Cherian , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20260224051153.3150613-1-anshuman.khandual@arm.com> <20260224051153.3150613-12-anshuman.khandual@arm.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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: C8381140009 X-Stat-Signature: nem9941mxexodgtbhh9k3ygawwwny9rz X-Rspam-User: X-HE-Tag: 1776249525-683632 X-HE-Meta: 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 uELswhWz CB3PyXCmAi8LbuD8KUJ99gRc0gwUlavJT/oTZsTSkjQ+X7Cj5XnIqazFsQFX+KfZQx6fsl87c596s+UkR3wN4kS8xn/aB1Fq39ljvjvTZhJBnd8XXp7jNUqDHHxZ00ieHFhOU45ST4x2hTuQLV5r/u6Q1SRhs9nqvhl6aV6Bfzc5/mA9jRsb139tSp/plJfRqZcpQqk9GzTx1a1Uf9X8Mj7NvtWxXcxjrnaodJT28e5NwzTjn4b2TwZbnhIs/8wnVv18BlX7VZJo6T9ynevDZ6DXb+mgCJJPMatiIJCxJCCch7XcSsp6dWWHm0Wt93/ZM1vee5ZM+c/3p9y1+cEhbyKSGw2Pg6dabpEfmBKC9T1e+MypaKbAhbn69XPl6PcaS4ui9SmMqPimgH97VfEDPY8NRCA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/10/26 06:02, Anshuman Khandual wrote: > On 08/04/26 5:58 PM, David Hildenbrand (Arm) wrote: >> On 2/24/26 06:11, Anshuman Khandual wrote: >>> Route all cmpxchg() operations performed on various page table entries to a >>> new ptdesc_cmpxchg_relaxed() helper. Similarly route all xchg() operations >>> performed on page table entries to a new ptdesc_xchg_relaxed() helper. >>> >>> Currently these helpers just forward to the same APIs that were previously >>> called direct, but in future we will change the routing for D128 which is >>> too long to use the standard APIs. >>> >>> Cc: Catalin Marinas >>> Cc: Will Deacon >>> Cc: Ryan Roberts >>> Cc: Mark Rutland >>> Cc: linux-arm-kernel@lists.infradead.org >>> Cc: linux-kernel@vger.kernel.org >>> Signed-off-by: Anshuman Khandual >>> --- >>> arch/arm64/include/asm/pgtable.h | 23 +++++++++++++++++------ >>> arch/arm64/mm/fault.c | 2 +- >>> 2 files changed, 18 insertions(+), 7 deletions(-) >>> >>> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h >>> index 42124d2f323d..cf69ce68f951 100644 >>> --- a/arch/arm64/include/asm/pgtable.h >>> +++ b/arch/arm64/include/asm/pgtable.h >>> @@ -87,6 +87,17 @@ static inline void arch_leave_lazy_mmu_mode(void) >>> #define ptdesc_get(x) READ_ONCE(x) >>> #define ptdesc_set(x, val) WRITE_ONCE(x, val) >>> >>> +static inline ptdesc_t ptdesc_cmpxchg_relaxed(ptdesc_t *ptep, ptdesc_t old, >>> + ptdesc_t new) >>> +{ >>> + return cmpxchg_relaxed(ptep, old, new); >>> +} >>> + >>> +static inline ptdesc_t ptdesc_xchg_relaxed(ptdesc_t *ptep, ptdesc_t new) >>> +{ >>> + return xchg_relaxed(ptep, new); >>> +} >>> + >> >> We really want the rename of ptdesc_t before this change. >> > > Planning to rename ptdesc_t as ptent_t in a pre-requisite > patch early in the series. Good. As discussed, something that contains "pxx" might be clearer than something that includes "pte". -- Cheers, David