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 C3FA8EA4FC0 for ; Mon, 23 Feb 2026 13:46:26 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EB7526B0088; Mon, 23 Feb 2026 08:46:25 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E8F396B0089; Mon, 23 Feb 2026 08:46:25 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DBB7B6B008A; Mon, 23 Feb 2026 08:46:25 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id CA34D6B0088 for ; Mon, 23 Feb 2026 08:46:25 -0500 (EST) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 79D8D13850E for ; Mon, 23 Feb 2026 13:46:25 +0000 (UTC) X-FDA: 84475845930.20.F25F3DC Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf07.hostedemail.com (Postfix) with ESMTP id 35E0B40014 for ; Mon, 23 Feb 2026 13:46:23 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=cszANuHk; spf=none (imf07.hostedemail.com: domain of BATV+48176073e30864d8fa6b+8219+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+48176073e30864d8fa6b+8219+infradead.org+hch@bombadil.srs.infradead.org; dmarc=pass (policy=none) header.from=infradead.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1771854383; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=JJ4KtBZ4k7mPQNvSdOKma/KrL8oFM/9ZCZpnL0vUUmQ=; b=QQRIS0JTEwjmAfsmhTkWChCgwUXuFw3sAKgDTRj7Voel0wl1k0V7ms4MaU6Zop+iF3dly1 CZolzNJ1/G4yCSRUVS/wj9MuD8EAh32hom+cKboksxpIPy7uSZlUrOXCM4rkdo/fMB2rD7 mtzeIUtSZo8kpn0Yqv9+XFXJIB8AUFE= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=cszANuHk; spf=none (imf07.hostedemail.com: domain of BATV+48176073e30864d8fa6b+8219+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+48176073e30864d8fa6b+8219+infradead.org+hch@bombadil.srs.infradead.org; dmarc=pass (policy=none) header.from=infradead.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771854383; a=rsa-sha256; cv=none; b=upUvY2g39nv0O2IBnun2hgvbGv6W2uMmLRagdB2oXUHwbc0OXHid4ihUYruB0XW61gxhhl 0Qvf1czGo1N9Iu3jbUaIwRRbI78W4AtDC8bzL43Wmpd5kJc1dzD9Q8djuSQgG33ZLj5QAX 1EfXXaC3WCq6UvQHDBQKc0PFm0seJSk= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=JJ4KtBZ4k7mPQNvSdOKma/KrL8oFM/9ZCZpnL0vUUmQ=; b=cszANuHklU70b08hJly+nRjFHg WEQcf911XV0uvJ2N74cAit4X9NPl4xV/giOETJPgb0YHIS521/q+bYzLZEUzd6pXStd06OMni3Eu5 mdT5LXABrkMHMDrT2Ju6QHSPhM6Ej1zfaMmrR+ZCGYYsKMgB3p0yVh1HY6u6aL8J6m1BuS9pUgrjA 81cuqWcc4U43+rrQruzTuAbrV9QaHXpKpD4f/2gAXhfdWy+OCrDVjEsMtAwibGd00Gsz4PnbtLBkn KXNs6D6p62k6+uYouKOuuxvOV3ttPQzzsK/RwvUZJi+Ia19k8oBEa9AQFTF9aY1xZ5hgD4P62KR3R 0xozqhkw==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vuWGG-00000000PAF-25JZ; Mon, 23 Feb 2026 13:46:08 +0000 Date: Mon, 23 Feb 2026 05:46:08 -0800 From: Christoph Hellwig To: Zi Yan Cc: linux-mm@kvack.org, David Hildenbrand , Andrew Morton , linux-erofs@lists.ozlabs.org, linux-block@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Jason Xing , Yushan Zhou , "Masami Hiramatsu (Google)" , Vlastimil Babka , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Christian Koenig , Huang Rui , Matthew Auld , Matthew Brost , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jens Axboe , Christian Brauner , K Prateek Nayak , Davidlohr Bueso , Eric Sandeen , Greg Kroah-Hartman , Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Todd Kjos , Carlos Llamas , Alice Ryhl , Damien Le Moal , Johannes Thumshirn , Dennis Zhou , Tejun Heo , Gao Xiang , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Chunhai Guo Subject: Re: [PATCH v1 00/11] Zero page->private when freeing pages Message-ID: References: <20260223032641.1859381-1-ziy@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260223032641.1859381-1-ziy@nvidia.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 35E0B40014 X-Stat-Signature: a13zinmgrzbp46fy41hb6yoiq7rus4qu X-HE-Tag: 1771854383-154316 X-HE-Meta: U2FsdGVkX1/gkuCGfOWfFb3OK+cVDy59vHodPLq9GREv75XzK+Z1JaN73Bfyzbw465i15JktQacHHF8QI8ILj7jynanEPjaupUxz9AmryJ9tE+/7km3rJQWdwRWSBU97FHlvJYJt9esrOJeRwHlxY8h1U1OrLucs+1/fwPH9VPy1QuQ2iXyP2NB0fl2kduASmaFPjPt9rdmvU54pwwRH6i7B0+tetFiqkJIQpRS3VUmcfOkTuWOgOS8s/LfFbPbS1Pmd6rvqpICo5DbkNWw91RxOMfoG9D6t4Xk3YaeZCNeDOUt9u55w3dOpnVotSZKNl6bE465pQnK7E7dKm0MXpgNK3tjsgL6B8HijYkLNeYkrOHV8nO3bjPtSvnzLtoRSUkj208VakxOfGJ/JJ4AZ+Gby3HZpGokjRfE812HRYFEzjh0kpw+fjAORM2kTW1tG3rV3Gb+8p5oB95x/cnNV3Od7yhlzKGVHNuHrurolF1JTtR7rQ9HCC0d6lv+yD8mEBceJDkN93xwrHKVKbkF0wvvnmYfQFFaiUu0Fwj647+6ikScryToHw6SX2wM0GWiJbhz0xMwpX17owBgTjltHkF0MvxuJQDSSF3M0iarnSvZMXKloi5u1GNtwGjNcRjXG6oQ8KqUwDhclEZ8QF8iCcTeWww4IDbcjusB5IEGEtC42GqWSdVtxsj/QRhOCjcaqHvH4bbyqQ0JKVl77A5qdsWRhzQnBvOp/t132Q+eJQAOeWHuDEcA0PeaodKz4kQeVaqfvpTdzciF8/EQaJ2GTg99WOrmJ+T7z5NzhIjiHuZkjW9n28G0AZov1iEFRXYa9to4sqQnuTqpWgk1HMhu+Fqzp4HXYZker2NSy2ISUbXa3E+g7OzcZ28tDI6oatrkF274C16gElh5Uf7X8iSOBxGF3TGpTjoU1+MBGKZFwspoxqk0qid7t5znSQ0hD5YKxJJ7V9zPj4FQWjyTTuXB 9IY5/F8t 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Feb 22, 2026 at 10:26:30PM -0500, Zi Yan wrote: > Hi all, > > Based on a recent discussion with David Hildenbrand on page->private > is not zero when a page is freed[1], this patchset is trying to fix all > users do not zero ->private when freeing a page and add checks to make > sure all freed pages have ->private set to zero. For compound pages, > both head page and tail pages need to have ->private set to zero. Requiring the user to clear a field before freeing is just a way to awkward interface. Don't do that.