Hi all! Here's v2; I hope I have incorporated all feedback properly. Julien: #S_X28 + 8 is in, but ftrace_modify_call() is referenced from generic code: kernel/trace/ftrace.c __ftrace_replace_code() And I'd *really* like some feedback from ARM/Linaro/... on the stack unwinder! [Changes from v1]: * Missing compiler support is now a Makefile error, instead of a warning. This will keep the compile log shorter and it will thus be easier to spot the problem. * A separate ftrace_regs_caller. Only that one will write out a complete pt_regs, for efficiency. * Replace the use of X19 with X28 to remember the old PC during live patch detection, as only that is saved&restored now for non-regs ftrace. * CONFIG_DYNAMIC_FTRACE_WITH_REGS and CC_USING_PATCHABLE_FUNCTION_ENTRY are currently synonymous on arm64, but differentiate better for the future when this is no longer the case. * Clean up "old"/"new" insn value setting vs. #ifdefs. * #define a INSN_MOV_X9_X30 with suggested aarch64_insn_gen call and use that instead of an immediate hex value. Torsten
