Hello, This series implements the stop_machine()-less ftrace code patching for s390. It's trickier than that of e.g. Intel, because the only on-the-fly code patching allowed by s390 is changing a mask of a conditional branch instruction. Patch 1 contains a new common code hook that we need for that, patch 2 contains the actual implementation as well as explanation of all the small details. We would like to take this series through the s390 tree, and we need a review on the patch 1 for that. Could you please take a look? Best regards, Ilya Ilya Leoshkevich (2): ftrace: Introduce ftrace_need_init_nop() s390/ftrace: implement hotpatching arch/s390/include/asm/ftrace.h | 46 +------ arch/s390/include/asm/ftrace.lds.h | 21 +++ arch/s390/include/asm/module.h | 8 ++ arch/s390/kernel/ftrace.c | 207 ++++++++++++++++++++++++++--- arch/s390/kernel/ftrace.h | 24 ++++ arch/s390/kernel/module.c | 45 +++++++ arch/s390/kernel/vmlinux.lds.S | 2 + include/linux/ftrace.h | 16 +++ kernel/trace/ftrace.c | 4 +- 9 files changed, 314 insertions(+), 59 deletions(-) create mode 100644 arch/s390/include/asm/ftrace.lds.h create mode 100644 arch/s390/kernel/ftrace.h -- 2.31.1
