On Fri, 30 Oct 2015, Josh Poimboeuf wrote:
> > But otherwise you are actually able to patch __init function of the module
> > (and we are doing exactly that) exactly the same way you are patching any
> > other module functions, because we are actually hooked to MODULE_COMING
> > notifier, which triggers before the module actually goes live (i.e. before
> > __init gets executed).
>
> This actually isn't possible, because __init functions don't have the
> __fentry call.
Ah, right you are, thanks.
This has been added in fed1939c ("ftrace: remove old pointers to mcount"),
and the justification is actually right not only for tracing, but for live
patching as well; the pointers haven't been filed into ftrace_pages yet,
so there is no way for us to redirect the code flow.
--
Jiri Kosina
SUSE Labs
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