On Tue, Jul 14, 2015 at 04:30:34PM -0500, Josh Poimboeuf wrote: > > How (if it does at all) deal with function-trace / -pg -fprofile-arcs > > things? Does it silently ignore the __mcount calls and assumes ftrace > > knows wtf its doing? ;-) > > Adding Steven to CC to keep me honest. > > In the case of "-pg -mfentry", which is what ftrace has relied on for Ah -mfentry is the magic word, I couldn't find it and a grep led me astray. > the past few years for newer versions of gcc, stackvalidate silently > ignores __fentry__ calls and assumes that ftrace indeed knows wtf it's > doing. I don't see a problem there as long as the ftrace handler > doesn't sleep. They should not indeed, however it would be very nice if backtraces would still be 'good'. > I haven't run stackvalidate on the old "-pg" mcount non-fentry stuff, > but I think it creates a stack frame before calling mcount, so it should > be fine. Ok. > I don't know much about -fprofile-arcs, but as far as I can tell, it's > only used for gcov. Right, nobody much uses that I think. -- To unsubscribe from this list: send the line "unsubscribe live-patching" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
