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 99D66C5B572 for ; Tue, 11 Aug 2026 16:20:07 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BD6536B009E; Tue, 11 Aug 2026 12:20:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BAE7B6B009F; Tue, 11 Aug 2026 12:20:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A9D8E6B00A0; Tue, 11 Aug 2026 12:20:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 829FB6B009E for ; Tue, 11 Aug 2026 12:20:01 -0400 (EDT) Received: from smtpin23.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 1FC9C404F8 for ; Tue, 11 Aug 2026 16:20:01 +0000 (UTC) X-FDA: 85089500202.23.37B5D09 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf03.hostedemail.com (Postfix) with ESMTP id 68CEE20009 for ; Tue, 11 Aug 2026 16:19:59 +0000 (UTC) Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=D9zlC8Ue; spf=pass (imf03.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=1786465199; 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=D7CISCZNOUacwFken/zE3V4XA36dbwptL0r4v8Me1CY=; b=IlJo/d8H73EFYmfDI1k2sEoQCCvPy3xe0rkf1WerjOQwXryxyDY61Uovf8ysYwucIOQN03 OkypAJ/ruBEmua5DNKzv9Oye89b54Z++pIZGU7/yOz1GDtOnaZoIHNmI7GwlS+IB+wp3/z wLLYT5ilBHaEb13MO5Xhzv+otYc16HM= ARC-Authentication-Results: i=1; imf03.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=D9zlC8Ue; spf=pass (imf03.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=1786465199; b=oaUKEoQaYhft3JfHEpDuDDKM3BlEK++wCL38xbKwrfwbmGcVetXYPMakJEFDQeXF03+mw+ MnQlsx9ZrTrSrGNhScrljN5Y37XCbxhkzjZ6MecBBcAPTwQPDwoSralTNvYYRurAkZi0xG kH51UA8iU0KIYzsM8B4a98Wa7EupS0o= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id F2A22600AE; Tue, 11 Aug 2026 16:19:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D44F91F000E9; Tue, 11 Aug 2026 16:19:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786465198; bh=D7CISCZNOUacwFken/zE3V4XA36dbwptL0r4v8Me1CY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=D9zlC8Ue7xyoRzrsbwUuTAn1JU7oiR5DVZid6WO7JwmYfxYK7juv4wK4YWA3jvPG9 fMNh6tkMCQAiV+0Zo803pEDObPx++QRzDbMTeqC8FVs213MQc6MHYwYbGM82/YGtMG tumFrAoC8OmH0ntJar3oMIJddzwnBWGwpC3au/UO2THkmABUJaTyb0scTymw68IjPu kkzGIAx14f0Jo7Xj9f/5/MjJGsLzrZgyFQOhYEJ9un76PSAbLqN1pq7gCZuqWWpzIm 6wtuElC4RxaAl6cqVD+qTUPqAZdGhDYxOoD/cQsukiy/qeg4CvEDax1X263j94k9PW qvRYNgLu9hing== Message-ID: <1d8cd29b-8a4d-454c-8dce-121b97e9d52b@kernel.org> Date: Tue, 11 Aug 2026 18:19:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 03/20] mm: introduce linear_anon_page_index() To: "Lorenzo Stoakes (ARM)" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , "Matthew Wilcox (Oracle)" , Jan Kara , Miaohe Lin , Naoya Horiguchi , Rik van Riel , Harry Yoo , Lance Yang , Kees Cook , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Usama Arif , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Peter Xu , Xu Xin , Chengming Zhou , Arnd Bergmann , Greg Kroah-Hartman , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Sven Schnelle , Alex Deucher , =?UTF-8?Q?Christian_K=C3=B6nig?= , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Boris Brezillon , Steven Price , Liviu Dudau , Huang Rui , Matthew Auld , =?UTF-8?Q?Thomas_Hellstr=C3=B6m?= , Rodrigo Vivi , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , Jason Gunthorpe , John Hubbard , Muchun Song , Oscar Salvador , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Youngjun Park Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-perf-users@vger.kernel.org, linux-trace-kernel@vger.kernel.org References: <20260806-b4-scalable-cow-virt-pgoff-v4-0-ab318a350404@kernel.org> <20260806-b4-scalable-cow-virt-pgoff-v4-3-ab318a350404@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 68CEE20009 X-Stat-Signature: zdsyo98cjo4okc8xjn44u1mgr63r1k35 X-Rspam-User: X-HE-Tag: 1786465199-821856 X-HE-Meta: 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 CNi2JS/c MvOQoKxBqQ82tHKhQ9xXkM8pVJOOSdbxu5gqFtPBM38VQBh6gfcTIZrEuXdKrYPnL2EJPIoeZeitMsXaV9Ua3BeqGntMFaZFb9f46ey/doEQT8/im2FS3Cra3d26MiCJ6/Wu5xV5eQvS3y48PHMDp2wKn7odjv0HmVonEz0OjJCM+lZrlq34lKqAap2Q89YOPjICopmzZp35w7rW+7QbwT3Ut101trflWI4WBWk3WjPlPGAxmBtakkpskqv8q24dYvobeayI5t9H73hnW3VL2X9GoQtbAnDDaG3Gung3GMcE1XF8J7YzZ8mPF4VZe0BVLecjO5EE6Ne/lDhwFHP5OniiVTl+KFWzVSqlbZ82tmG0nyoTVO3tab/emaVtFf/YQmW6dhFBIPz3WRdbaxutq+hx4L5Sll0SXhlDPPkFObVhukHctKHCCCExBVI568xAf04FJ3tw82rr7S3vZdFUfk3dUaQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/6/26 22:21, Lorenzo Stoakes (ARM) wrote: > This function provides the anonymous equivalent of linear_page_index(), > instead offsetting based on the anonymous page offset of the VMA. > > It is valid only for anonymous or MAP_PRIVATE file-backed mappings, in > other words CoW mappings. > > For pure anon VMAs, this will be equal to linear_page_index(). > > Assert that both of these invariants are true In linear_anon_page_index() > and implement the algorithm in __linear_anon_page_index(). > > Note that MAP_PRIVATE-/dev/zero mappings will satisfy vma_is_anonymous() > but not fulfill this invariant, so when asserting this we check > vma->vm_file to account for this. > > We do not update callsites yet, so no functional change intended. > > Also const-ify vma_is_anonymous() to make it compatible with the > const-ified linear_anon_page_index(). > > While we're here, update linear_page_index() to be more succinct. > > VMA userland tests are also updated accordingly. > > Reviewed-by: Gregory Price (Meta) > Signed-off-by: Lorenzo Stoakes (ARM) > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David