On Sun, 10 Dec 2006 16:40:53 -0800 Jeremy Fitzhardinge wrote: > Randy Dunlap wrote: > > Is it OK for section .parainstructions to reference > > exit.text? > > > > I'm seeing: > > > > WARNING: drivers/net/hamradio/scc.o - Section mismatch: reference to .exit.text: from .parainstructions after '' (at offset 0x0) > > WARNING: drivers/net/hamradio/scc.o - Section mismatch: reference to .exit.text: from .parainstructions after '' (at offset 0x8) > > > > If that's OK, we need a small patch to modpost, as below. > > > > What are the semantics of .exit.text? In principle a paravirtualized > instruction can appear anywhere, so I think these warnings are bogus. > The only concern is if one of these sections disappears before the > paravirt_ops instruction substitution happens. Good question. I don't see much doc on that subject. Rusty could probably answer that better than me. Something like this: .exit.text section(s) can be discarded from built-in (non-modular) code (or not even loaded at all). .exit.text section(s) in modules is only loaded when CONFIG_MODULE_UNLOAD=y. so what are the .parainstructions text sections for? Are they for replacing code instructions based on some condition(s)? (like <gag> self-modifying code? </gag>) --- ~Randy
