On 10/17/16 6:21 AM, Stephen Hemminger wrote:
> No if/else needed. No cast of void * ptr need. Use const if possible?

so much of the stack does not use const and trying to add it for this API does 
not work -- the upper or lower device is passed to the callbacks and those 
callbacks invoke other apis. e.g., the bond patch calls vlan_get_encap_level, 
bond_verify_device_path and bond_confirm_addr and none of those accept a const 

v3 coming up with the more succinct versions, but const is not possible.

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