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 43818418368; Mon, 12 Oct 2026 18:42:48 +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=1791830569; cv=none; b=Rxg+77SDM+Efnquvr/aIzdoHPKMYkCxMLRSNDakvHJp9mcFvVthfIlSUJ+3b7Z/bpgH5EjdF3PJ5XuQ0o/Njl81oEnJtgBwmz8evSjK0CCqdAR+yiq93gVu32WItlHHaxvTKuLj1+RcmT4eiNBzQs9Hfd4IFZmdE1HrWthjjVQY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791830569; c=relaxed/simple; bh=q3iFIPtkeBYdlkMfRHwAGhnJ4vLG2VxdmNp7CiHGM7Q=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JbsO3Y11V642LeD9XNpF+jCOZgUo/rlvPi7+ytoh1IwunpcL/aPVk09LqI+qid9m9bQXiKKS5zwWbGPEKBnKDbW28NPshps4lIDYFmvgSZhLw9fh2MCDekBvK0u9mFgPoQvvYyUXWZSzPk94eCvgE02F5YNn+Xv1uiUv8DRJYC8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JMZ7nmyc; 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="JMZ7nmyc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC16F1F0089B; Mon, 12 Oct 2026 18:42:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791830567; bh=+7HtUATMHV4dGHIv5dVrYZXCU2Hx2YbbFxHYHdPPqaQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=JMZ7nmycwzQ0zWeow0izPPknZRcO/wgySmNtYtRnBKvciZBko71ogizDs2RS9o1nN QiJEsk0Fxkq8JfZgvdubthyoVQPH7sKqFsuYgs9+nqaXwRCaGHTXgvCfX6o+rQWzIt 3aFBzjUGWc0uejpx2JphrOIG95SlKwCApFjGagHpKWtfkWQIb9WHor6tqgHRYos/NF XpRQM8iXCxBBK1nhGTZJAutT/h7Lttuzuq8A1yYgdaoeROtDphWPD9Ms9Mp3EHyQtX H8UGNcWAWLzTdAnnqrMy2sHZGYx4f1rtbM2A3wa79fE/o4qCg3V4fr1GGKHMjgYesz R/LnsHiSg/EwA== Date: Mon, 12 Oct 2026 19:42:15 +0100 From: "Lorenzo Stoakes (ARM)" To: "David Hildenbrand (Arm)" Cc: Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Greg Kroah-Hartman , Dennis Dalessandro , Jason Gunthorpe , Leon Romanovsky , Paul Moore , Stephen Smalley , Jaroslav Kysela , Takashi Iwai , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Doug Gilbert , "James E.J. Bottomley" , "Martin K. Petersen" , Simona Vetter , Helge Deller , Sebastian Reichel , John Hubbard , Peter Xu , Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Rik van Riel , Harry Yoo , Juri Lelli , Vincent Guittot , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Arnd Bergmann , Muchun Song , Oscar Salvador , "Matthew Wilcox (Oracle)" , Jan Kara , Marc Zyngier , Oliver Upton , Catalin Marinas , Madhavan Srinivasan , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , "David S. Miller" , Andreas Larsson , Alexander Viro , Christian Brauner , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Youngjun Park , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chengming Zhou , Michal Hocko , Miklos Szeredi , Xu Xin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-usb@vger.kernel.org, linux-rdma@vger.kernel.org, selinux@vger.kernel.org, linux-sound@vger.kernel.org, bpf@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, fuse-devel@lists.linux.dev, Ihor Solodrai , Bert Karwatzki Subject: Re: [PATCH v5 25/38] mm: remove VMA_IO_BIT check in vma[_flags]_is_mm_managed() Message-ID: References: <20261009-b4-mmap-prepare-vma-flag-sanify-v5-0-923b70125b1e@kernel.org> <20261009-b4-mmap-prepare-vma-flag-sanify-v5-25-923b70125b1e@kernel.org> Precedence: bulk X-Mailing-List: linux-sound@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: On Mon, Oct 12, 2026 at 08:31:59PM +0200, David Hildenbrand (Arm) wrote: > On 10/9/26 20:04, Lorenzo Stoakes (ARM) wrote: > > We have now made it such that every driver which sets VMA_IO_BIT marks it > > as not mm-managed. > > Confusing given that mm-managed check tests VMA_IO_BIT. Yeah, true. Getting rid of that is a really nice improvement to understanding in general... > > Maybe combining this with the next paragraph could make this easier to grasp > > "vma_flags_is_mm_managed() still checks for VMA_IO_BIT, and if set, treats it as > non-mm-managed. This was previously required to handle driver that would set > VMA_IO_BIT but none of the other flags that would indicate a VMA as non-mm-managed. > > We already established now that a driver that sets VMA_IO_BIT must set one of > the other VMA flags that allow for identifying it as non-mm-managed. > > ... > " Ack, will update to something like this. > > --- a/mm/vma.c > > +++ b/mm/vma.c > > @@ -2796,7 +2796,7 @@ static int mmap_validate_vma_flags(const vma_flags_t *flags) > > return -EINVAL; > > #endif > > > > - if (!vma_flags_test_any(flags, VMA_PFNMAP_BIT, VMA_MIXEDMAP_BIT)) { > > + if (vma_flags_is_mm_managed(flags)) { > > Ah, there is the change. Yup! Was an annoying dance to have to do. > > Acked-by: David Hildenbrand (Arm) Thanks! -- Cheers, Lorenzo