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. The patch 01/03 is to consolidate the function definition which can be suared cross architectures, patches 02,03/03 are used for enabling function error injection on arm64 and arm architecture respectively. I tested on arm64 platform Juno-r2 and one of my laptop with x86 architecture with below steps; I don't test for Arm architecture 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 with Debian rootFS: # cd $kernel # make headers_install # make samples/bpf/ LLC=llc-7 CLANG=clang-7 - Run the sample tracex7: # dd if=/dev/zero of=testfile.img bs=1M seek=1000 count=1 # DEVICE=$(losetup --show -f testfile.img) # mkfs.btrfs -f $DEVICE # ./tracex7 testfile.img [ 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. Changes from v1: * Consolidated the function definition into asm-generic header (Will); * Used APIs to access pt_regs elements (Will); * Fixed typos in the comments (Will). Leo Yan (3): error-injection: Consolidate override function definition arm64: Add support for function error injection arm: Add support for function error injection arch/arm/Kconfig | 1 + 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/ptrace.h | 5 +++++ arch/arm64/lib/Makefile | 2 ++ arch/arm64/lib/error-inject.c | 18 ++++++++++++++++++ arch/powerpc/include/asm/error-injection.h | 13 ------------- arch/x86/include/asm/error-injection.h | 13 ------------- include/asm-generic/error-injection.h | 6 ++++++ include/linux/error-injection.h | 6 +++--- 12 files changed, 62 insertions(+), 29 deletions(-) create mode 100644 arch/arm/lib/error-inject.c create mode 100644 arch/arm64/lib/error-inject.c delete mode 100644 arch/powerpc/include/asm/error-injection.h delete mode 100644 arch/x86/include/asm/error-injection.h -- 2.17.1
