This series adds ftrace direct call for arm64, which is required to attach bpf trampoline to fentry. Although there is no agreement on how to support ftrace direct call on arm64, no patch has been posted except the one I posted in [1], so this series continues the work of [1] with the addition of long jump support. Now ftrace direct call works regardless of the distance between the callsite and custom trampoline. [1] https://lore.kernel.org/bpf/20220518131638.3401509-2-xukuohai@xxxxxxxxxx/ v2: - Fix compile and runtime errors caused by ftrace_rec_arch_init v1: https://lore.kernel.org/bpf/20220913063146.74750-1-xukuohai@xxxxxxxxxxxxxxx/ Xu Kuohai (4): ftrace: Allow users to disable ftrace direct call arm64: ftrace: Support long jump for ftrace direct call arm64: ftrace: Add ftrace direct call support ftrace: Fix dead loop caused by direct call in ftrace selftest arch/arm64/Kconfig | 2 + arch/arm64/Makefile | 4 + arch/arm64/include/asm/ftrace.h | 35 ++++-- arch/arm64/include/asm/patching.h | 2 + arch/arm64/include/asm/ptrace.h | 6 +- arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kernel/entry-ftrace.S | 39 ++++-- arch/arm64/kernel/ftrace.c | 198 ++++++++++++++++++++++++++++-- arch/arm64/kernel/patching.c | 14 +++ arch/arm64/net/bpf_jit_comp.c | 4 + include/linux/ftrace.h | 2 + kernel/trace/Kconfig | 7 +- kernel/trace/ftrace.c | 9 +- kernel/trace/trace_selftest.c | 2 + 14 files changed, 296 insertions(+), 29 deletions(-) -- 2.30.2
