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Add test to verify that updating [lru_,]percpu_hash maps decrements refcount when BPF_KPTR_REF objects are involved. The tests perform the following steps: . Call update_elem() to insert an initial value. . Use bpf_refcount_acquire() to increment the refcount. . Store the node pointer in the map value. . Add the node to a linked list. . Probe-read the refcount and verify it is *2*. . Call update_elem() again to trigger refcount decrement. . Probe-read the refcount and verify it is *1*. Signed-off-by: Leon Hwang <leon.hwang@linux.dev> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20251105151407.12723-3-leon.hwang@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>