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Howlett" , Asahi Lina , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, iommu@lists.linux.dev, linux-mm@kvack.org Subject: Re: [PATCH v3] io: add io_pgtable abstraction Message-ID: <20251119115316.5de0239a@fedora> In-Reply-To: <8A5C6836-992B-477A-A77C-EE0736166552@collabora.com> References: <20251112-io-pgtable-v3-1-b00c2e6b951a@google.com> <8A5C6836-992B-477A-A77C-EE0736166552@collabora.com> Organization: Collabora X-Mailer: Claws Mail 4.3.1 (GTK 3.24.51; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Stat-Signature: it84mgzfcn6dgx563ibpgocw9bjro84r X-Rspam-User: X-Rspamd-Queue-Id: 8248A140006 X-Rspamd-Server: rspam01 X-HE-Tag: 1763549603-693143 X-HE-Meta: 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 Dz+x75FT 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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 Wed, 12 Nov 2025 09:57:09 -0300 Daniel Almeida wrote: > > + /// Unmap a range of virtually contiguous pages of the same size. > > + /// > > + /// # Safety > > + /// > > + /// This page table must contain a mapping at `iova` that consists= of exactly `pgcount` pages > > + /// of size `pgsize`. =20 >=20 > Same here. I don=E2=80=99t think the above is necessarily a requirement. It's not, indeed, the returned size will tell you how much was unmapped if there's less to unmap, or the region has holes.