Breno Leitao wrote:

Complete the SKB pool management refactoring by moving find_skb() from
netpoll core to netconsole driver, making it a static function.

This is the final step in removing SKB pool management from the generic
netpoll infrastructure. With this change:

1. Netpoll core is now purely transmission-focused: Contains only
   the essential netpoll_send_skb() function for low-level packet
   transmission, with no knowledge of SKB allocation or pool management.

2. Complete encapsulation in netconsole: All SKB lifecycle
   management (allocation, pool handling, packet construction) is now
   contained within the netconsole driver where it belongs.

3. Cleaner API surface: Removes the last SKB management export from
   netpoll, leaving only zap_completion_queue() as a utility function
   and netpoll_send_skb() for transmission.

4. Better maintainability: Changes to SKB allocation strategies or
   pool management can now be made entirely within netconsole without
   affecting the core netpoll infrastructure.

The find_skb() function is made static since it's now only used within
netconsole.c for its internal SKB allocation needs.

This completes the architectural cleanup that separates generic netpoll
transmission capabilities from console-specific resource management.

Signed-off-by: Breno Leitao <leitao@debian.org>

Reviewed-by: Willem de Bruijn <willemb@google.com>