[PATCH v1 0/5] Implement livepatch on PPC32

[Steven Rostedt]

On Tue, 14 Dec 2021 08:35:14 +0100
Christophe Leroy <christophe.leroy at csgroup.eu> wrote:

> > Will continue investigating.
> >   
> 
> trace_selftest_startup_function_graph() calls register_ftrace_direct() 
> which returns -ENOSUPP because powerpc doesn't select 
> CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS.
> 
> Should TEST_DIRECT_TRAMP depend on CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS ?

Yes, that should be:

#if defined(CONFIG_DYNAMIC_FTRACE) && \
    defined(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS)
#define TEST_DIRECT_TRAMP
noinline __noclone static void trace_direct_tramp(void) { }
#endif


And make it test it with or without the args.

Thanks for finding this.

-- Steve