From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 306BE30CDA1 for ; Mon, 8 Sep 2025 15:22:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757344953; cv=none; b=CobG9IGnFTyukPVS83BfJkZCwK20YSH2FGlAJT+c1SsIP6bK+qAqJQB8GfgPX5Dn2Z0Hos1uwrRw6iC3oyJAVDO9NkCOz9UmmJLo3wW7TTEsNLcU4jpxCbPu6IUDzkD7qEw5fGeqwdQRnmmy2EKbX5q+NS4Lnkmm6GosMvvacuI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757344953; c=relaxed/simple; bh=F32FXDZGXwaYxsj8gbSU0nKzm4ocUmQnsK9BI1F5gkk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=D1oMcTmreuoy2lOUc5ixYYTUTBNi9X8LU8+fwyI2O8PI2J5igM7jQhbUC3Rg7LdBtWgPqfFqxRhvrLQJvY0lqDjB3/QREYSkl5lC8VrXHaF7PSakkPoaDc6l7BILrVYcilFZrv6RrUD/YyPOifn+f0autUyuFaaT3KYHoVlysmU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Q1gHV7iQ; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Q1gHV7iQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1757344951; h=from:from: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:autocrypt:autocrypt; bh=w4KMjz9pZf6Gn5SDTmwCP/agoyxxfuBiYUtMKRyfuzo=; b=Q1gHV7iQQzLoc2JypY3ed8RF2ersFi4XoZdJAN9UkZwZeStmVXy5BNPS6K/vhi390pyPYn bv6CI7RSOZRZKvbBBZafSFQ0ivJ3HMpGeIdWqghxnDZMIjuRP63DGI0h0onid3Adr6yQj2 tXlsgsRIaKMqm6nXKPus0Q2CknWxVUI= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-629-qIWG2zu9M5GtpnImziNr2A-1; Mon, 08 Sep 2025 11:22:30 -0400 X-MC-Unique: qIWG2zu9M5GtpnImziNr2A-1 X-Mimecast-MFC-AGG-ID: qIWG2zu9M5GtpnImziNr2A_1757344948 Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-45cb5dbda9cso28429235e9.2 for ; Mon, 08 Sep 2025 08:22:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757344948; x=1757949748; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=w4KMjz9pZf6Gn5SDTmwCP/agoyxxfuBiYUtMKRyfuzo=; b=rfT2VfzRMK+MgbqXK5fq+/ABDIlzOvkcJ3TOreYt7bt45D82RxQsbkill4iRot+dew Sn3fimmRENnW209StSWKt1wiHJSSYMCdoLj2I3E26myjgRmdBoXNg2tvo+lg/c/Ro8Tf bsmDhoHva/nA5yR7rRvHikOSieATtd6sA1zd4eI6fwvlLmPHw6CIWGCm+gZJ7vzVxd3P dm82oA7I+XRMt2bqBeSm9ApVXdPV0w/G2PZh4EEIziUJsG7CbNBt6B3XXMj0HtoyP5hw 9HH7Ma4hWOAbv1OiM0Ve4XtZhhKagVp4SR7OIuY/NJtxT4vGP7XT4Fr4vJMRCyDtOR7g VTeA== X-Forwarded-Encrypted: i=1; AJvYcCWBQ6lVKMb/lCqDW7b0CNZw0m729H42AZ3f8Pt1MUB55hxQYe3z6hlQnTXq50/y9C6/MADPjrljNMjz@vger.kernel.org X-Gm-Message-State: AOJu0YyI1VncVGJtDJzb7D9cGqGXKxR4FrDbmr9KMr6CsFBoNjnSlC4A g4gY/ZFIBwI7nvnKotzKGLAt+P7tbt1uAYXQCBmlWTiGHs7IsRGvjUE3wPQmEclhlyJjOenGmHS 9ml0gOQsxCrPmmo92zyi/E8Tqk3J0fIOFqwr+D2k1pKDC9lAZlFw28IfpxLYOqcY= X-Gm-Gg: ASbGncsPFFgoCoFQrR+WipIf8YBU8Z7ZVRZr3uI1/C4BTxAIJGaqge38zHskEP07Tzo 7l7h+VQX5vTSZDyId6xb7vYoeYnTsXFZ8UwK22430StXPfIZOSe7AUPQRHKriJVP1siFf6TWOM4 LFuQeslpK1q6IDXcEwsdADCLPR/1ZyHKVFie/k2o8ta63J8sqnCrC5n5Z55gTHPrGAQ7okXMbLx opoow2xMiC7N8CweMuoN0g53YGYXDxByMlXuMl24aJLdENQUz19axOF344wVDOLtUBmzwhcJwbF XzGFPfFP0fSvIms7O/ueRutwYyc7+ZtnXNoz9C/4kfbKaLzhjAT9c3v/Sl1nG5rytZPVup8Fk95 WX618aKsHfVKsbaWWtTKAA1mpv7hSe7TL/QeYPJ99d3LooPn/RBKjwRDjfvor8v1Y X-Received: by 2002:a05:600c:34cb:b0:45d:e0cf:41c9 with SMTP id 5b1f17b1804b1-45de0cf447fmr65101195e9.22.1757344947804; Mon, 08 Sep 2025 08:22:27 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGHYVI7uetiSbrjm9XefV08PSiCwYstCNobj3gljiWL9Oji0Bqd7BtZyoiA+b/dW0fMqgLp+w== X-Received: by 2002:a05:600c:34cb:b0:45d:e0cf:41c9 with SMTP id 5b1f17b1804b1-45de0cf447fmr65100515e9.22.1757344947304; Mon, 08 Sep 2025 08:22:27 -0700 (PDT) Received: from ?IPV6:2003:d8:2f25:700:d846:15f3:6ca0:8029? (p200300d82f250700d84615f36ca08029.dip0.t-ipconnect.de. [2003:d8:2f25:700:d846:15f3:6ca0:8029]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3cf276d5e5fsm42252142f8f.27.2025.09.08.08.22.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Sep 2025 08:22:26 -0700 (PDT) Message-ID: <83d3ef61-abc7-458d-b6ea-20094eeff6cd@redhat.com> Date: Mon, 8 Sep 2025 17:22:24 +0200 Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 19/37] mm/gup: remove record_subpages() To: Mark Brown Cc: linux-kernel@vger.kernel.org, Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, "Liam R. Howlett" , Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Lorenzo Stoakes , Marco Elver , Marek Szyprowski , Michal Hocko , Mike Rapoport , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org, Zi Yan References: <20250901150359.867252-1-david@redhat.com> <20250901150359.867252-20-david@redhat.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+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; format=flowed Content-Transfer-Encoding: 7bit On 08.09.25 17:16, Mark Brown wrote: > On Mon, Sep 01, 2025 at 05:03:40PM +0200, David Hildenbrand wrote: >> We can just cleanup the code by calculating the #refs earlier, >> so we can just inline what remains of record_subpages(). >> >> Calculate the number of references/pages ahead of times, and record them >> only once all our tests passed. > > I'm seeing failures in kselftest-mm in -next on at least Raspberry Pi 4 > and Orion O6 which bisect to this patch. I'm seeing a NULL pointer > dereference during the GUP test (which isn't actually doing anything as > I'm just using a standard defconfig rather than one with the mm > fragment): On which -next label are you on? next-20250908 should no longer have that commit. -- Cheers David / dhildenb