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PD#TV-3541 Problem: 1.only vmalloc 4KB at first. 2.if user space need more memory, try to allocate a new vmalloc range with large size and move all related data to new place. 3.the first 4KB is not free when release this binder. Solution: free the first 4KB when release binder. Verify: R311 Change-Id: I4429de04a260671e4626b77ec340e47e436d5c8d Signed-off-by: changqing.gao <changqing.gao@amlogic.com>