From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 C0F89846F; Sat, 18 Jul 2026 14:51:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784386286; cv=none; b=JoMp37aKKIam1l/iqoxMZfjfAS6IuUCs/+Qn3AGbu2mcOq+JqBBrvxP5k8SqlxE/JLgd2u1HSKElUzBFkYF1T1++nV7ThZqDGKQdO9OXrW/i2XfdgYrDk7BFOhvwjxu5kCMB3QemEbNde9jQPeSqPtTvITwn2HBpb+wxBJP7IVA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784386286; c=relaxed/simple; bh=QVTyAHdyQbOjaIzcZFuM8h+GebtHrm41hCcQoy2O7EE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=kczJcVjnrp/F66ZYwe3hBl50Cj3ugqByH0EzEPBC5GQ7Uwc5mSZZnKxibrhByFnB9Ws2qw76zoguyn5d+yEJ3l2L0G92lb/lo2qVS7rRJLkByIvhp2wSjD2GeXxUFfpOwm0JFo1xB07MSNvvLaYOhRJi8lvWp9rNgm7mIZbFqV0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nWBF0EqB; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nWBF0EqB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 730901F000E9; Sat, 18 Jul 2026 14:51:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784386285; bh=RRQXKgZvVOLKJU51yTAps58jYtNd2L+HPiejoWLGke8=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=nWBF0EqBfhjHJvpdqs+h1dzr94c9R4BdvZwbvKLWoOESTja4JB8XXnNcOenPFuVrD w7k7v7C0XoPBQ9ot5oa3yL77Ju8nMOEldt3fYz6cgfVAB+G39pdKaF88Ki3lc/9V6T gL7bTRbDAm4Q7ch74uTOKPfnOaygB2dp5AQzutVMra7CSwPlrBvudf3cQy8AZUoEOU Ao6sj4DJz/LIPxR9eCGY1xzCh0Zxlz3ViOs7LF7onoabL8Cnftip5KbkplrpgSd4Ud DEZoMWo46oXL0e+rwwhLC4vLVh7414ZS3dRMbSlALPDPJ4RKbFbprP7iy6qqaZejt2 ovzYl7a1tfFgA== Date: Sat, 18 Jul 2026 15:51:02 +0100 From: "Lorenzo Stoakes (ARM)" To: Andrew Morton , David Hildenbrand , "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 Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH 07/15] mm/rmap: track whether the page VMA mapped walk is anonymous Message-ID: References: <20260717-b4-scalable-cow-virt-pgoff-v1-0-cf24910ef094@kernel.org> <20260717-b4-scalable-cow-virt-pgoff-v1-7-cf24910ef094@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260717-b4-scalable-cow-virt-pgoff-v1-7-cf24910ef094@kernel.org> On Fri, Jul 17, 2026 at 07:19:45PM +0100, Lorenzo Stoakes (ARM) wrote: > diff --git a/mm/rmap.c b/mm/rmap.c > index 5798427d007f..cfd4195ff1ae 100644 > --- a/mm/rmap.c > +++ b/mm/rmap.c > @@ -1240,8 +1240,10 @@ static bool mapping_wrprotect_range_one(struct folio *folio, > .vma = vma, > .address = address, > .flags = PVMW_SYNC, > + .is_anon_walk = false, > }; > > + VM_WARN_ON_ONCE(folio_test_anon(folio)); Andrew - can you drop this line please? It's incorrect (folio is always NULL here). Thanks! Cheers, Lorenzo