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1. Allow using bpf_kptr_xchg while holding a lock. 2. When the rb_node contains a __kptr pointer, we do not need to perform a remove-read-add operation. This patch implements the following workflow: 1. Construct a rbtree with 16 elements. 2. Traverse the rbtree, locate the kptr pointer in the target node, and read the content pointed to by the pointer. 3. Remove all nodes from the rbtree. Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn> Signed-off-by: Feng Yang <yangfeng@kylinos.cn> Link: https://lore.kernel.org/r/20260214124042.62229-4-pilgrimtao@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>