This small patch set is to add support for function error injection; this can be used to eanble more advanced debugging feature, e.g. CONFIG_BPF_KPROBE_OVERRIDE. I only tested the first patch on arm64 platform Juno-r2 with below steps; the second patch is for arm arch, but I absent the platform for the testing so only pass compilation. - Enable kernel configuration: CONFIG_BPF_KPROBE_OVERRIDE CONFIG_BTRFS_FS CONFIG_BPF_EVENTS=y CONFIG_KPROBES=y CONFIG_KPROBE_EVENTS=y CONFIG_BPF_KPROBE_OVERRIDE=y - Build samples/bpf on Juno-r2 board with Debian rootFS: # cd $kernel # make headers_install # make samples/bpf/ LLC=llc-7 CLANG=clang-7 - Run the sample tracex7: # ./tracex7 /dev/sdb1 [ 1975.211781] BTRFS error (device (efault)): open_ctree failed mount: /mnt/linux-kernel/linux-cs-dev/samples/bpf/tmpmnt: mount(2) system call failed: Cannot allocate memory. Leo Yan (2): arm64: Add support for function error injection arm: Add support for function error injection arch/arm/Kconfig | 1 + arch/arm/include/asm/error-injection.h | 13 +++++++++++++ arch/arm/include/asm/ptrace.h | 5 +++++ arch/arm/lib/Makefile | 2 ++ arch/arm/lib/error-inject.c | 19 +++++++++++++++++++ arch/arm64/Kconfig | 1 + arch/arm64/include/asm/error-injection.h | 13 +++++++++++++ arch/arm64/include/asm/ptrace.h | 5 +++++ arch/arm64/lib/Makefile | 2 ++ arch/arm64/lib/error-inject.c | 19 +++++++++++++++++++ 10 files changed, 80 insertions(+) create mode 100644 arch/arm/include/asm/error-injection.h create mode 100644 arch/arm/lib/error-inject.c create mode 100644 arch/arm64/include/asm/error-injection.h create mode 100644 arch/arm64/lib/error-inject.c -- 2.17.1
