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.
(changelog from Chuck Ebbert <76306.1226@compuserve.com> - thanks ;))
Signed-off-by: Masami Hiramatsu <hiramatu@sdl.hitachi.co.jp>
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
c9becf58d9