* Steven Rostedt <srostedt@xxxxxxxxxx> wrote: > On Thu, 2008-12-18 at 11:17 +0800, Shaohua Li wrote: > > This is the IA64 port of dyn ftrace. In IA64, there are some issues we > > must solve. > > 1. kernel compile has different option against module compile, so I > > extend the Makefile.build/recordmcount.pl script to distinct the two > > cases. > > 2. in a module, each routine's mcount call will call a PLT stub, which > > will call kernel mcount. We can't simply make the mcount call call into > > kernel mcount, as kernel and mocule have different gp and the > > instruction just supports 25bit offset. So I introduced a new PLT stub, > > which will call into kernel ftrace_caller. When module loading, all > > mcount call will be converted to nop. When the nop is converted to call, > > we make the call to the new PLT stub instead of old mcount PLT stub. > > Have you taken a look at how powerpc64 does it? > > You can look at Ingo's tip tree under the branch tip/tracing/powerpc, or > my own tree under tip/ftrace/ppc. it's at: http://people.redhat.com/mingo/tip.git/README > My tree is at: > > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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