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Message-ID: <Ysws7LOirtQ07JG/@casper.infradead.org> Date: Mon, 11 Jul 2022 15:00:12 +0100 From: Matthew Wilcox <willy@...radead.org> To: David Hildenbrand <david@...hat.com> Cc: Alex Sierra <alex.sierra@....com>, jgg@...dia.com, Felix.Kuehling@....com, linux-mm@...ck.org, rcampbell@...dia.com, linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, hch@....de, jglisse@...hat.com, apopple@...dia.com, akpm@...ux-foundation.org Subject: Re: [PATCH v8 07/15] mm/gup: migrate device coherent pages when pinning instead of failing On Mon, Jul 11, 2022 at 03:35:42PM +0200, David Hildenbrand wrote: > > + /* > > + * Device coherent pages are managed by a driver and should not > > + * be pinned indefinitely as it prevents the driver moving the > > + * page. So when trying to pin with FOLL_LONGTERM instead try > > + * to migrate the page out of device memory. > > + */ > > + if (folio_is_device_coherent(folio)) { > > + WARN_ON_ONCE(PageCompound(&folio->page)); > > Maybe that belongs into migrate_device_page()? ... and should be simply WARN_ON_ONCE(folio_test_large(folio)). No need to go converting it back into a page in order to test things that can't possibly be true.
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