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The rcu_scale_writer() function needs only a fixed number of rcu_head structures per kthread, which means that a trivial allocator suffices. This commit therefore uses an llist-based allocator using a fixed array of structures per kthread. This allows aggressive testing of RCU performance without stressing the slab allocators. Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>