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b=ly9MG+Tyt+/Kbi+lbUoiqKMMboC21eSgm1KPIa1Cg8Xq2DOehnJ+nV4MS1RowzHSm YjS5KSKgz92mjrAKLYOUJdfW7InnjFFpOhR2dnGMbUSL1Egom1QteTcJEAx7Kyv+5Q DbpkumyUx84Y1vU+p6dubEccdW3OPKw1G1K3CiYkyXlD4tJKDkJlNtLPimlje3oy03 eVy4LUulNEpmOVzf6SorSevqzbaq0W3xBn4Lpuj65VMtlHpfWOxWWe8k3OYhgt3vk/ +jMNptxNuMs+t+8bLHIvkFgi7XsqpybbVd0LaxrvgZ2GdI37uijQQas7xVewjKZgj3 T3dIpAsoyNDEA== Message-ID: <9ee22635-a219-47bb-a397-bc4e141b408d@kernel.org> Date: Fri, 27 Feb 2026 22:11:00 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 01/13] mm/migrate_device: Introduce migrate_pfn_from_page() helper To: Jordan Niethe , linux-mm@kvack.org Cc: balbirs@nvidia.com, matthew.brost@intel.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, ziy@nvidia.com, apopple@nvidia.com, lorenzo.stoakes@oracle.com, lyude@redhat.com, dakr@kernel.org, airlied@gmail.com, simona@ffwll.ch, rcampbell@nvidia.com, mpenttil@redhat.com, jgg@nvidia.com, willy@infradead.org, linuxppc-dev@lists.ozlabs.org, intel-xe@lists.freedesktop.org, jgg@ziepe.ca, Felix.Kuehling@amd.com, jhubbard@nvidia.com, maddy@linux.ibm.com, mpe@ellerman.id.au, ying.huang@linux.alibaba.com References: <20260202113642.59295-1-jniethe@nvidia.com> <20260202113642.59295-2-jniethe@nvidia.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 6F6A780018 X-Stat-Signature: kuei9daf6o6tgukiztq6knkwzpyiaupf X-Rspam-User: X-HE-Tag: 1772226669-847994 X-HE-Meta: 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 ngUtALz/ c1g9abtGEnjqJMmurkidf7io5FGO9okHdwht7AwvV5Ixbpu86V4k4WOy6rZL5tFf6M4+1ip/AGyPFU1aoPJGjJ6WxE/+plyhshlDeYDtWLD9gaLkHLKLQVLaDCiQXpqLnPvjO3Cr0Eoy2WA+tMnRLO1BO6S/BSqEce75GT7DTrsXOGKzC8BIwtCMCBPjsLKQryhzRdP3p+l3Wt2RG3cEUtHjpv7tI1Z57PWfJ1LyyBf7pMKEGf8yNu684Hm+bPTUMcoGG7TXnBaBw70BuChyZ+bQQdArQnp0dPi9JKymqSDDQWWAc56VvF2PtGZlCUcb8RtbgFDes+JwmFu4gfE1GQpddo/FPa+4+6cQsOhqwSFQCqbs1tKnhqHCmqw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/2/26 12:36, Jordan Niethe wrote: > To create a migrate entry from a given struct page, that page is first > converted to its pfn, before passing the pfn to migrate_pfn(). > > A future change will remove device private pages from the physical > address space. This will mean that device private pages no longer have a > pfn and must be handled separately. > > Prepare for this with a new helper: > > - migrate_pfn_from_page() > > This helper takes a struct page as parameter instead of a pfn. This will > allow more flexibility for handling the mpfn differently for device > private pages. > > Reviewed-by: Balbir Singh > Acked-by: Felix Kuehling > Signed-off-by: Jordan Niethe > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David