where's the definition of trace_kfree_skb?

[valdis.kletnieks at vt.edu]

On Tue, 28 Mar 2017 16:15:57 +0800, Shiyao Ma said:

> I saw this function invocation,
> trace_kfree_skb(skb, __builtin_return_address(0));
>
> so I grepped the source for "trace_kfree_skb", but I found no where it's defined.

For some uses, the Linux kernel forms a definition via the preprocessor, by
gluing together several strings.

Try doing 'git grep trace_##'  (or 'grep -r trace_## .' if you don't have a git tree.
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