2.6.16-rc1-mm5: explanation text for kretprobe-kretprobe-booster.patch

[Chuck Ebbert <76306.1226@compuserve.com>]

In kretprobe-kretprobe-booster.patch:

> From: Masami Hiramatsu <hiramatu@sdl.hitachi.co.jp>
>
> What does this do?
>

Here's a description:

In normal operation, kretprobe makes a target function return
to trampoline code. A kprobe (called trampoline_probe) has
been inserted in the trampoline code. When the kernel hits this
kprobe, it calls kretprobe's handler and it returns to the original
return address.

Kretprobe-booster removes the trampoline_probe. It allows the
trampoline code to call kretprobe's handler directly instead of
invoking kprobe. The trampoline code returns to the original return
address.

-- 
Chuck
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