netdev - Re: [PATCH 0/2] arm/arm64: Add support for function error injection

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Date:   Wed, 17 Jul 2019 16:14:56 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Russell King <linux@...linux.org.uk>,
        Oleg Nesterov <oleg@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Justin He <Justin.He@....com>
Subject: Re: [PATCH 0/2] arm/arm64: Add support for function error injection

On Wed, Jul 17, 2019 at 04:52:22PM +0900, Masami Hiramatsu wrote:
> On Tue, 16 Jul 2019 19:12:59 +0800
> Leo Yan <leo.yan@...aro.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@...nel.org>
> 
> For this series.
> 
> Thank you,

Thank you for reviewing, Masami.

> > 
> > 
> > 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@...nel.org>