[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 at efficios.com> 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.