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Embedding net_device into structures prohibits the usage of flexible arrays in the net_device structure. For more details, see the discussion at [1]. Un-embed the net_device from the private struct by converting it into a pointer. Then use the leverage the new alloc_netdev_dummy() helper to allocate and initialize dummy devices. [1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/ Signed-off-by: Breno Leitao <leitao@debian.org> Link: https://lore.kernel.org/r/20240424161108.3397057-1-leitao@debian.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>