On Sun, Dec 28, 2008 at 05:43:49AM +0800, Sam Ravnborg wrote: > On Fri, Dec 26, 2008 at 03:48:59PM +0800, Shaohua Li wrote: > > Hi, > > I'm now porting dyn ftrace to IA64. To make modules work, I must add a > > piece of code (trampoline code) to each module. I can't add the > > trampoline code in module load, because at that time, only PLT > > trampoline code can be added, and that code isn't ok for ftrace. I > > wonder if this can be done in kbuild. If yes, how can I do it? > > Powerpc does something remotely similar. > In their arch Makefile they have: > > LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o > > > But there is some issues with it. > If you do a plain "make modules" then arch/powerpc/lib/crtsavres.o is not > built and module link fails. > There is IIRC also some issues with external modules. > > Anohter option could be to add the code to the module.mod.c file > that modpost generates. > But if we go that route we have to do it in some generic way so > all archs can benefit from it. I'm thinking of this kind of approach too. We need link a .S file instead of .c file, looks ppc adds a .S file too. I managed to figure out an implementation, but kbuild is out of my knowledge. Could kbuild team help on this, clearly there are two archs require this? Thanks, Shaohua -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
