On Thu, Oct 01, 2020 at 11:17:15AM -0700, Ralph Campbell wrote: > ZONE_DEVICE struct pages have an extra reference count that complicates the > code for put_page() and several places in the kernel that need to check the > reference count to see that a page is not being used (gup, compaction, > migration, etc.). Clean up the code so the reference count doesn't need to > be treated specially for ZONE_DEVICE. I was hoping this patch would resolve a page-reference issue that we run into at random times while migrating a page to a device page backed by secure-memory. Unfortunately I continue to see the problem. There is a reference held on that page, which fails the migration. FYI RP
