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Add bpf_struct_ops_id() to enable struct_ops implementors to use struct_ops map id as the unique id of a struct_ops in their subsystem. A subsystem that wishes to create a mapping between id and struct_ops instance pointer can update the mapping accordingly during bpf_struct_ops::reg(), unreg(), and update(). Signed-off-by: Amery Hung <ameryhung@gmail.com> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://patch.msgid.link/20250806162540.681679-2-ameryhung@gmail.com