Michael Jeanson <mjeanson@xxxxxxxxxxxx> writes: > 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. Aha, OK that explains it I guess. I was using ppc64_guest_defconfig which has ABI_V1 and FTRACE_SYSCALLS, but does not have KALLSYMS_ALL. So I guess there's some other bug lurking in there. cheers
