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staging/rdma/hfi1: use RCU_INIT_POINTER() when NULLing.
It is safe to use RCU_INIT_POINTER() to NULL a pointer, instead of rcu_assign_pointer(). This results in slightly smaller/faster code. Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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