Netipv4ipforwardc

static inline int ip_forward_finish(struct sk_buff *skb) { }

This means that it is shown as a normal function, but the compiler does not invoke it by means of a classic function call (pass parameters, set instruction pointers to function code, read arguments, etc.). Instead, the entire C code is copied to the point at which the function is invoked. Although this results in a longer executable (particularly for larger functions), it is compensated by speed gains. The GNU C compiler guarantees that inline functions are as fast as macros if this approach is adopted.

However, starting with kernel 2.6.24, the inline definition could be removed in nearly all cases!

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