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Message-Id: <20190806100015.11256-1-leo.yan@linaro.org>
Date: Tue, 6 Aug 2019 18:00:12 +0800
From: Leo Yan <leo.yan@...aro.org>
To: Russell King <linux@...linux.org.uk>,
Oleg Nesterov <oleg@...hat.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
Arnd Bergmann <arnd@...db.de>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-arch@...r.kernel.org,
netdev@...r.kernel.org, bpf@...r.kernel.org,
clang-built-linux@...glegroups.com,
Masami Hiramatsu <mhiramat@...nel.org>
Cc: Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v2 0/3] arm/arm64: Add support for function error injection
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
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