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Add the functionality that allow users of shmem to reclaim its pages without going through the kswapd/direct reclaim path. An example usecase is: Say that device allocates a larger amount of shmem pages and shares it with hardware. To faster reclaims such pages, drivers can register the shrinkers and call reclaim_shmem_address_space(). The implementation of this function is mostly borrowed from reclaim_address_space() implemented for per process reclaim[1]. [1] https://lore.kernel.org/patchwork/cover/378056/ Bug: 187798288 Change-Id: I03d2c3b9610612af977f89ddeabb63b8e9e50918 Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>