Re: [PATCH v4 4/9] fprobe: rethook: Use ftrace_regs in fprobe exit handler and rethook

Masami Hiramatsu (Google) [off-list ref] writes:

I found that this is not enough becuase s390/loongarch already implemented
their rethook, and as far as I can see, the s390 ftrace_regs does not save
the required registers for rethook. Thus, for such architecture, we need
another kconfig flag and keep using the pt_regs for rethook.

Looking into arch_rethook_trampoline() i think we save all required
registers - which register do you think are missing? Or is there another
function i should look at?