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Date:   Wed, 17 Jul 2019 16:52:22 +0900
From:   Masami Hiramatsu <mhiramat@kernel.org>
To:     Leo Yan <leo.yan@linaro.org>
Cc:     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,
        Justin He <Justin.He@arm.com>
Subject: Re: [PATCH 0/2] arm/arm64: Add support for function error injection
Message-Id: <20190717165222.62e02b99ebc16e23c3b81de2@kernel.org>
In-Reply-To: <20190716111301.1855-1-leo.yan@linaro.org>
References: <20190716111301.1855-1-leo.yan@linaro.org>
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On Tue, 16 Jul 2019 19:12:59 +0800
Leo Yan <leo.yan@linaro.org> wrote:

> 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.

This series looks good to me from the view point of override usage :)

Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>

For this series.

Thank you,

> 
> 
> 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
> 


-- 
Masami Hiramatsu <mhiramat@kernel.org>