Re: [RFC] perf probe: Fix offline module name missmatch issue

[Ravi Bangoria]

Thanks Masami,

On Tuesday 26 April 2016 07:49 AM, Masami Hiramatsu wrote:
> On Tue, 26 Apr 2016 06:24:38 +0900
> Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
> > > +/*
> > > + * NOTE:
> > > + * '.gnu.linkonce.this_module' section of kernel module elf directly
> > > + * maps to 'struct module' from linux/module.h. This section contains
> > > + * actual module name which will be used by kernel after loading it.
> > > + * But, we cannot use 'struct module' here since linux/module.h is not
> > > + * exposed to user-space. Offset of 'name' has remained same from long
> > > + * time, so hardcoding it here.
> > > + */
> BTW, is there no way to get the module name avoiding to access
> this "hidden" data structure?
> This looks very tricky way...

So this is the same approach kernel use to find module name when module is
loaded. Please refer this function for more detail:

kernel/module.c ::  static struct module *setup_load_info(...)

Regards,
Ravi