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Exercise the dirty tracking bitmaps with byte unaligned addresses in addition to the PAGE_SIZE unaligned bitmaps, using a address towards the end of the page boundary. In doing so, increase the tailroom we allocate for the bitmap from MOCK_PAGE_SIZE(2K) into PAGE_SIZE(4K), such that we can test end of bitmap boundary. Link: https://lore.kernel.org/r/20240202133415.23819-4-joao.m.martins@oracle.com Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>