Messages in this thread | | | Date | Thu, 10 Mar 2016 13:51:16 +0100 | From | Petr Mladek <> | Subject | Re: [PATCH 2/2] ppc64le live patch: get rid of mini stack frame |
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On Thu 2016-03-10 13:25:08, Petr Mladek wrote: > On Wed 2016-03-09 18:30:17, Torsten Duwe wrote: > > After the mini stack frame is no longer required for TOC storage, it can > > be eliminated iff the functionality of klp_return_helper, which required > > a stack frame for the extra return address previously, is carried out > > by the replacement function now. This requires _every_ live patch replacement > > function to execute the following (or similar) sequence of machine instructions > > just before every return to the original caller: > > I have thought about it and it is a nono from my point of view. > It is too error prone, especially that there are functions that > call return on several locations.
BTW: How is this solved in kretprobes? Or is it easier there?
Best Regards, Petr
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