Re: [PATCH v6 01/10] mm: add zone device coherent type memory support

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On Fri, Feb 11, 2022 at 05:15:25PM +0100, David Hildenbrand wrote:

> ... I'm pretty sure we cannot FOLL_PIN DEVICE_PRIVATE pages

Currently the only way to get a DEVICE_PRIVATE page out of the page
tables is via hmm_range_fault() and that doesn't manipulate any ref
counts.

Jason



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