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 2E77EC79F99 for ; Tue, 8 Sep 2026 12:50:34 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 48EED6B008A; Tue, 8 Sep 2026 08:50:33 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 466C76B008C; Tue, 8 Sep 2026 08:50:33 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 37F2B6B0092; Tue, 8 Sep 2026 08:50:33 -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 0A4BF6B008A for ; Tue, 8 Sep 2026 08:50:33 -0400 (EDT) Received: from smtpin24.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 3A5851C2800 for ; Tue, 8 Sep 2026 12:50:32 +0000 (UTC) X-FDA: 85190578704.24.5FAC6C7 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf14.hostedemail.com (Postfix) with ESMTP id 62187100002 for ; Tue, 8 Sep 2026 12:50:30 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=ZMSl8cWl; spf=pass (imf14.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 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=1788871830; 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=lKBFZhPs/eGo1uvy79sNZrgCL1vNlvYuvk0BKQC0ZEM=; b=Kwj1MTZkkEoTAO/NGi099wu+by2X7XPQQe4/b48Ex0w50P053DljpCqU/cy3p/Y0cNYULe gKbvor5aw3ucJ8N6OZpi8H+sboh6qanzHxJ+M++mGGHo/Vm512m3Xp7wgiS1476j6qE+R2 dZStYoT1BSES94Lt6UdbhSSd1Ud7Vbg= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1788871830; b=N1rmbHyVTb22LLUomrpZERpguJWvWW8DRwdQaF0Y47oEd9vN4Ui/dHwq8BMoKP/xL8Xh02 lwA494mmA90FfnTaZ3+cS77IYnYWx+63ZXClaPYIRWSGxlFBbIAXHL2aCBVF1Ox/+mkpiN c6eTW4vcdj9Q+6w57RCx9PEptx+4KLc= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=ZMSl8cWl; spf=pass (imf14.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 4097340BF9; Tue, 8 Sep 2026 12:50:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1E3F1F00A3A; Tue, 8 Sep 2026 12:50:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788871829; bh=lKBFZhPs/eGo1uvy79sNZrgCL1vNlvYuvk0BKQC0ZEM=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=ZMSl8cWlZMT42GbWGlAWuzPvmeOJqJWUYg1qsIu94uFfoz+Te7zxeDYfXksLXAJ5V WYuV2oW/intOhz7QqS0OB5E3MqY4cinTQdtPvLsUXhXg+5If5fVdcFpL1PAq1LZWUn MNLqKWJI6OGqZlVtApYZ08dDdaTa25Un0TP+7Z1V4zuCvJfG9VivLOZtZBnc9Gz9aQ 9PaeweDbuOXRgo9OZzNOCYAsgkT6cBHsJjn2EswgkbHR+aeartlg+PqJSLEIMp8aT0 1zMHjbLzaYSTa23T22YJcnae5sBCdirvTOcp8Vutl0LGe/wmJ/ZOmc53SF5MdJqkPw SyDZxQ9lanGQg== Message-ID: Date: Tue, 8 Sep 2026 14:50:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 6/6] tools/testing/selftests/mm: add MAP_PRIVATE-/dev/zero merge tests To: "Lorenzo Stoakes (ARM)" , Arnd Bergmann , Greg Kroah-Hartman , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Hugh Dickins , Baolin Wang , "Matthew Wilcox (Oracle)" , Jan Kara Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org References: <20260908-map-private-dev-zero-v2-0-acc7b5625305@kernel.org> <20260908-map-private-dev-zero-v2-6-acc7b5625305@kernel.org> 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: <20260908-map-private-dev-zero-v2-6-acc7b5625305@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: eaz8fm9wgd8o4zgo11rwxnimxg7mqhgt X-Rspam-User: X-Rspamd-Queue-Id: 62187100002 X-Rspamd-Server: rspam03 X-HE-Tag: 1788871830-608450 X-HE-Meta: U2FsdGVkX19OqdyEfYd4mtewhEJLraJyyfhuv75nO+2oJrSmrZpnheBQlyktq1Vil2Y9XeJi+fxM0aVKzagr2inakDY0MDcsVjNDsBO6t9aG9lPLdkUsCRRfBAJ5kGBpncjTEulBaVZGU1CJmQG3rrc7Rlsv3MDWJslznmDnzCNFzdCTGjQn7JJ/QMbnLitWLDmFEep99yPTOgPQL/wYyWoDGrd+eMpkdzQ3D/cmmMgo6NsIEPaqR+e2RPI7DLcrzjz4Iblkuae0c5jjoT8uXeTKcTFZZDBx9W6YX0IfGukWBv7UUKUhCSmRXM2vIXqsRmhpbt1GasMtgox6mccxSQ81BryPQscnH3tXcvUGUFcgKRaDqr+yGM73uw2w+f1/jtzdmqRpafs4JJwdJ6JaWn+y4AuQE6v0u8MjpOzIUncvb1hSD1dM4Ca6COmnDL1YVhxJmxXR+DMjsmU5po53b+YPesL74xBZSes+ytugDb5zaOnPvD1WzSLnkjRRwcp726cmWsAKN5YFRNowpWTucnuPrJcXvsHWkeGmPxxNxYO2Jnk75cczWzxL2yVCWU2UbWqueBs9dBGMDUu6RqypJN2KrNE8nlOpv5218OTc8C+R0EmM/ytwi5dqWT8RrUQapblARTEZPp9DNIwysO8dSthtAV/zw0/1idoUk84IOWMrkKb8iTqM9iEoPqcypL2B/z+p3btPTGlpRf3uUho9KDs3qUyZy2PCenlfLoBBENgg4CRSDijeElampjYSZ6Wp+aW5RRlwxuraSoXwybVCiYfOo1jyYqZHF2h9TfRsUtn1EQoAms/8eNvaFB92C1aVSgecivAQOcCUY5yiDyvc9wwoguotX4FzI4L+Di6lC9J6dMfBLXCoR7eMikNEKCsdgmx32qE476WCY7hpUKe1pTAlMthp8q0WVQQWClaVdP5IvKv7CaDoXATZS2ewYISXBJZXUbXEe4WkvbN2W5l 7obpuEul bQwiK/GP8PJmoPQ8w6+fK/6d5WQSPFjEsEKKHkyYkAUrhcSfO6K1NC0jv2cd+iC/9YgqfmYSdpgHXULWJHvslizhMKCV2XiVJlrqNI89geEHeMADhAeBrq/NZi6cyvterj+vbFENhxSPCaodWG3zU4vGBbCU/QAhJDFMy4wWzEfMtWXgruw5lLmFFrhqh+8j9OWUSbfFUHnsfWeLxHX21nOvmivaBSpf9vV/Ld06kgsF7kQTruemgb6vM2SYswFFlv6wgOBHaneqpMhM0NW0psNwZrWP2SK5FY+xeFBiNz6S7EGaHzoFgAlu1B2WVVyGEPaX6r+Fgr3UoMz0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/8/26 13:23, Lorenzo Stoakes (ARM) wrote: > Assert that MAP_PRIVATE-mapped /dev/zero mappings behave like they are > anonymous. > > Test both unfaulted and faulted/unfaulted merges with page offset 0 which > would not merge if the mappings were treated as if they were file-backed. > > With the recent change that makes them behave as pure anonymous mappings, > the merges should succeed as their page offsets are equal to their > anonymous page offsets. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David