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 1DAF1CA5FCB for ; Thu, 1 Oct 2026 11:35:21 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7E3C56B0092; Thu, 1 Oct 2026 07:35:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7BB436B0093; Thu, 1 Oct 2026 07:35:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6D1BD6B0095; Thu, 1 Oct 2026 07:35:20 -0400 (EDT) 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 261746B0092 for ; Thu, 1 Oct 2026 07:35:20 -0400 (EDT) Received: from smtpin20.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay10.hostedemail.com (Postfix) with ESMTP id D37D9C03AA for ; Thu, 1 Oct 2026 11:35:17 +0000 (UTC) X-FDA: 85273851474.20.7E91ADA Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf26.hostedemail.com (Postfix) with ESMTP id 3112D140003 for ; Thu, 1 Oct 2026 11:35:16 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=exBCzXDy; spf=pass (imf26.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=1790854516; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to: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=IR+/nwhsFwuNmBp3vUC3gN77geHokdiIHhVMCgtINUc=; b=67rQ3b8McxAvr2qLtS1sBaOC1UjDVPBTm8Lc/jivVnmhREpnOKKZWOJlrXW+SBEfi9DqpE YUkI59exJ4uOdxM7PupKHAoO6iQUy/BX3y82kb0Dyc87PS+FwFRzrVDvNSqe5zPCyY/Csl 0BCkFk8QGKExR/N2o7f3CmOI9RsIZMg= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=exBCzXDy; spf=pass (imf26.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; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790854516; b=ZkItAAi4GvaiEHnU8PY8cUCC1a3/afCpEkoXltBJZabUh3Ne/jvpDIaSmg2270HAE0gKIB LHv3AGwxwNPKrgjMWwlV5/SBJOtqF7BD5OFQcH2c7v5V9/SSK/YcnSkDxB/lpom6M7C9QM 0K8KE/qTtrjcJ+rm0vJlhoO87Pg3Ris= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id AB8E260A58; Thu, 1 Oct 2026 11:35:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3AF01F000FF; Thu, 1 Oct 2026 11:35:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790854515; bh=IR+/nwhsFwuNmBp3vUC3gN77geHokdiIHhVMCgtINUc=; h=Date:Subject:To:References:From:In-Reply-To; b=exBCzXDy4UfhbBpIf5ElPtsGdou5G37JN1w6zO7SBcy+SQbM6GyJXwNHkbHPDnbpX IiL40C+o59OcASc4wrLOZbNwO4nID9qatgAYSxpMwSl4u+eS+DnMWbLJ5jPdhKguBz 8DBRKcQwqHEVHiKYWYVCAkwFeR6Jg1rqW3UD/xHeiC7vbIPaflaLY2qYQb7tUo0sGe NmZkPEy0IidKDzc1gEE3dajCaIi9wfaS96HPGSWyAU25kIVWUG+OdoesMdrtY2EGRc t1Jpoo3+ZwnDxJMNa57kL89/A8Sb2vVsmQHZNPRrjThEc6Ig3JrTgP9deNmUZWKIqT M/Trwd49yf+nw== Message-ID: <819802b5-e8b0-41dc-a1d3-8ed843d9a769@kernel.org> Date: Thu, 1 Oct 2026 13:35:05 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/7] maccess: Use a scoped guard to re-enable page faults To: Muhammad Usama Anjum , Catalin Marinas , Will Deacon , Mark Rutland , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" , open list , "open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)" , "open list:MEMORY MANAGEMENT - CORE" References: <20260824160523.3907021-1-usama.anjum@arm.com> <20260824160523.3907021-6-usama.anjum@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: <20260824160523.3907021-6-usama.anjum@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: aqxbsg48sumqo3sb53uz4zu6nntcgh7o X-Rspamd-Queue-Id: 3112D140003 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1790854516-356733 X-HE-Meta: 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 5AXgWXGH Q9rgtldyhv7oN32YsgyMbs6d5Ti7gSWAk2caUdFKbEjen1clGBMncfQZ5J0yncKzqIuAKZvu3oG5NwqrsxrpZNsoXhsLf9nI3veESlNtQIV23kon4oabf5iy9rn+MO3Zju6CvnUKTZQ8rb1JwvPGl4p4YXZV2Z4mNdhUiJZ4RVcFhSop4qkBE5/d7RrU3VT7upJqrstucgGqU0FXMN48PAw23kekNmOBVbLP5qAj1Pzc+fFsyEV1ZFdjblVWUGe5aale57q+zUbQaReQVvHnt0mdEGRXBg++y09JVF1glgKhOBUfpG5u8mhz8IliuH7oD5/mQQr4izMNKThBlvXz4zNtcCg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/24/26 18:04, Muhammad Usama Anjum wrote: > Kernel nofault copy and string paths open-code page-fault disable and > enable around label-based loops, duplicating cleanup on success and > failure. > > Use a page-fault scope guard instead. Leaving the scope now re-enables > page faults on both paths without separate cleanup at the fault label. > > No functional change. > > Signed-off-by: Muhammad Usama Anjum > --- Patch itself is fine, but the guard name is completely misleading. Acked-by: David Hildenbrand (Arm) -- Cheers, David