Michael Jeanson mjeanson@efficios.com writes:
On 2022-12-05 15:11, Michael Jeanson wrote:
Michael Jeanson mjeanson@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.
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