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Miller" , Andreas Larsson , Arnd Bergmann , Greg Kroah-Hartman , Dan Williams , Vishal Verma , Dave Jiang , Nicolas Pitre , Muchun Song , Oscar Salvador , David Hildenbrand , Konstantin Komarov , Baoquan He , Vivek Goyal , Dave Young , Tony Luck , Reinette Chatre , Dave Martin , James Morse , Alexander Viro , Christian Brauner , Jan Kara , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Hugh Dickins , Baolin Wang , Uladzislau Rezki , Dmitry Vyukov , Andrey Konovalov , Jann Horn , Pedro Falcato , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-csky@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-mm@kvack.org, ntfs3@lists.linux.dev, kexec@lists.infradead.org, kasan-dev@googlegroups.com Subject: Re: [PATCH 08/16] mm: add remap_pfn_range_prepare(), remap_pfn_range_complete() Message-ID: <20250908160306.GF789684@nvidia.com> References: <895d7744c693aa8744fd08e0098d16332dfb359c.1757329751.git.lorenzo.stoakes@oracle.com> <20250908130015.GZ616306@nvidia.com> <20250908133538.GF616306@nvidia.com> <34d93f7f-8bb8-4ffc-a6b9-05b68e876766@lucifer.local> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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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 Mon, Sep 08, 2025 at 03:18:46PM +0100, Lorenzo Stoakes wrote: > On Mon, Sep 08, 2025 at 10:35:38AM -0300, Jason Gunthorpe wrote: > > On Mon, Sep 08, 2025 at 02:27:12PM +0100, Lorenzo Stoakes wrote: > > > > > It's not only remap that is a concern here, people do all kinds of weird > > > and wonderful things in .mmap(), sometimes in combination with remap. > > > > So it should really not be split this way, complete is a badly name > > I don't understand, you think we can avoid splitting this in two? If so, I > disagree. I'm saying to the greatest extent possible complete should only populate PTEs. We should refrain from trying to use it for other things, because it shouldn't need to be there. > > The only example in this series didn't actually need to hold the lock. > > There's ~250 more mmap callbacks to work through. Do you provide a guarantee > that: I'd be happy if only a small few need something weird and everything else was aligned. Jason