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This is a significant simplification, no extra list is kept per FD, and the interval tree is now shared between all the ucontexts, reducing overhead if there are multiple ucontexts active. Link: https://lore.kernel.org/r/20190806231548.25242-7-jgg@ziepe.ca Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>