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From: Leo Yan <leo.yan@linaro.org>
To: Russell King <linux@armlinux.org.uk>,
	Oleg Nesterov <oleg@redhat.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>, Arnd Bergmann <arnd@arndb.de>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, Masami Hiramatsu <mhiramat@kernel.org>,
	Justin He <Justin.He@arm.com>
Cc: Leo Yan <leo.yan@linaro.org>
Subject: [PATCH 0/2] arm/arm64: Add support for function error injection
Date: Tue, 16 Jul 2019 19:12:59 +0800
Message-ID: <20190716111301.1855-1-leo.yan@linaro.org> (raw)

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


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Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-16 11:12 Leo Yan [this message]
2019-07-16 11:13 ` [PATCH 1/2] arm64: " Leo Yan
2019-07-25  1:42   ` Leo Yan
2019-07-31 16:08   ` Will Deacon
2019-07-31 16:58     ` Leo Yan
2019-07-16 11:13 ` [PATCH 2/2] arm: " Leo Yan
2019-07-25  1:48   ` Leo Yan
2019-07-17  7:52 ` [PATCH 0/2] arm/arm64: " Masami Hiramatsu
2019-07-17  8:14   ` Leo Yan

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