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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 85821CA5FAC for ; Tue, 29 Sep 2026 11:21:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=teQ0X8sirtLxrf7OIY9KIY9xO/5EkZsH/FpQDmRqk8Q=; b=ipxvw3gGt46RzQ 59bAxKDn5ywkl8V1Bq4ULEVU7oBZxviE18eY9SjdJGk5Lbsm7Yi7QisXg1uDCwCC9+X0Qr/Ah+ByY Njs9DZSW8XOsz+6aJpdBYnHl9tBFIrwxUhUgejwuzOpAvaALxLgBGoLjCmUnLP+FDCttfDAQ8ZAx7 TnCLp7TbcyLbpaQcmASr9CCNnCDN+5q4kb12oCCAciNy1Rx1uOnUv+WeoXTXjdKhW3L4XzRDf6aaV kSlO9ZXXnXBEGpYsWhw/k/m1MkcckGhGK3Tcn2U27EzGaZZ56i18142arqzzFfKSmExPFaDDxRLQi kD5Y1TWJlP0pvK5IFGrw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBVuJ-00000003OWU-0NhW; Tue, 29 Sep 2026 11:21:59 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBVuI-00000003OWF-1HRb; Tue, 29 Sep 2026 11:21:58 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id DC5D640D70; Tue, 29 Sep 2026 11:21:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3D1B1F000FF; Tue, 29 Sep 2026 11:21:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790680917; bh=2fPL1r0q3ZFaPVm8LMil7KkezedSBA8/3rMeLvpxPeA=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=R7ZIalgU2YxoignykHVl41GbwXVq+ymjE2Si4HRcFErNll2DzNwd43/xyUICNL9Gh ZKbhOo6icKbcmsuOqmHY4vcYGDVk0I9HhEjHuNVoiCF/g/yVcf+z3KLnyerzZ1MiXd W5Z9bZBV7t1tkUZVxlpq6Ci9stfsy0TAMMeCuz+nSAiebkXEgWtguADRz3DWyBpZ+H mIWJYnCrwO2dvpBgpuGcPLGHOAHxCMNlWV4hSF1En76lTAsSQsZ+wBOPbyH1ksC26r xgTJ+Vceyq3XFJSuuzXLjQ/8jCstGixi8blBDf2nxCsI5axooCKVBfsc28vfxzNygJ YWOKPhtuzPNAg== Date: Tue, 29 Sep 2026 12:21:22 +0100 From: "Lorenzo Stoakes (ARM)" To: Zi Yan Cc: Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , David Hildenbrand , 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 , 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" , Jaya Kumar , 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 Subject: Re: [PATCH v3 09/40] docs: filesystems: update mmap_prepare docs for discontig kernel pgs Message-ID: References: <20260917-b4-mmap-prepare-vma-flag-sanify-v3-0-4583d8a23bca@kernel.org> <20260917-b4-mmap-prepare-vma-flag-sanify-v3-9-4583d8a23bca@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: kvm-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org On Fri, Sep 25, 2026 at 05:01:51PM -0400, Zi Yan wrote: > On Thu Sep 17, 2026 at 12:22 PM EDT, Lorenzo Stoakes (ARM) wrote: > > Documentation/filesystems/mmap_prepare.rst | 81 ++++++++++++++++++++++++++++++ > > +* ``discontig_kernel_map_page()`` - Maps a single page, correctly handling > > + compound pages (if the compound page is bigger than the remaining pages in the > > + VMA, then only those pages that fit will be mapped). For a compound page, the > > + head page must be passed. > > +* ``discontig_kernel_map_page_range()`` - Map an array of pages of a specified > > + size. Note that if the number of pages specified exceeds the VMA size then an > > + error will arise. > > Why do mapping a compound page and a page range have different behaviors > on the bound? Either both do partial mappings or give errors when a > given input cannot be mapped as a whole in the VMA. Ack, yeah similar to Suren's point on patch 8, will clamp for both. -- Cheers, Lorenzo -- kvm-riscv mailing list kvm-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kvm-riscv