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

[Leo Yan]

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@xxxxxxxxxx> 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@xxxxxxxxxx>
> 
> Thank you!

Thanks a lot for reviewing, Masami.

Leo.