linux-kernel - Re: [PATCH v2 0/3] arm/arm64: Add support for function error injection

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Date:   Wed, 7 Aug 2019 09:31:39 +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>,
        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
Subject: Re: [PATCH v2 0/3] arm/arm64: Add support for function error
 injection

On Wed, Aug 07, 2019 at 09:08:11AM +0900, Masami Hiramatsu wrote:
> On Tue,  6 Aug 2019 18:00:12 +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.
> > 
> > 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).
> 
> This looks good to me.
> 
> Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>
> 
> Thank you!

Thanks a lot for reviewing, Masami.

Leo.