On Thu, Oct 14, 2021 at 10:39:28AM -0500, Alex Sierra wrote:

From: Ralph Campbell <redacted>

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.

Signed-off-by: Ralph Campbell <redacted>
Signed-off-by: Alex Sierra <redacted>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>