Re: [PATCH] powerpc/ftrace: fix syscall tracing on PPC64_ELF_ABI_V1

[Michael Jeanson]

On 2022-12-05 15:11, Michael Jeanson wrote:
> > > > Michael Jeanson <mjeanson@xxxxxxxxxxxx> writes:
> > > > > In v5.7 the powerpc syscall entry/exit logic was rewritten in C, on
> > > > > PPC64_ELF_ABI_V1 this resulted in the symbols in the syscall table
> > > > > changing from their dot prefixed variant to the non-prefixed ones.
> > > > >
> > > > > Since ftrace prefixes a dot to the syscall names when matching them to
> > > > > build its syscall event list, this resulted in no syscall events being
> > > > > available.
> > > > >
> > > > > Remove the PPC64_ELF_ABI_V1 specific version of
> > > > > arch_syscall_match_sym_name to have the same behavior across all powerpc
> > > > > variants.
> > > >
> > > > This doesn't seem to work for me.
> > > >
> > > > Event with it applied I still don't see anything in
> > > > /sys/kernel/debug/tracing/events/syscalls
> > > >
> > > > Did we break it in some other way recently?
> > > >
> > > > cheers

I did some further testing, my config also enabled KALLSYMS_ALL, when I remove 
it there is indeed no syscall events.