Re: [PATCH v5 8/8] LoongArch: Add ORC stack unwinder support

[Tiezhu Yang]

On 12/03/2023 08:42 PM, Huacai Chen wrote:
> On Wed, Nov 29, 2023 at 9:07 PM Tiezhu Yang <yangtiezhu@xxxxxxxxxxx> wrote:
> > The kernel CONFIG_UNWINDER_ORC option enables the ORC unwinder, which is
> > similar in concept to a DWARF unwinder. The difference is that the format
> > of the ORC data is much simpler than DWARF, which in turn allows the ORC
> > unwinder to be much simpler and faster.

...

> > diff --git a/arch/loongarch/lib/Makefile b/arch/loongarch/lib/Makefile
> > index a77bf160bfc4..e3023d9a508c 100644
> > --- a/arch/loongarch/lib/Makefile
> > +++ b/arch/loongarch/lib/Makefile
> > @@ -3,6 +3,8 @@
> >  # Makefile for LoongArch-specific library files.
> >  #
> >
> > +OBJECT_FILES_NON_STANDARD := y
> > +
> >  lib-y  += delay.o memset.o memcpy.o memmove.o \
> >            clear_user.o copy_user.o csum.o dump_tlb.o unaligned.o
> I have a draft live-patch patch here:
> https://github.com/chenhuacai/linux/commit/744942cbf456b320f2333638e4bd27d35900284c
>
> But we get such an error:
>
> # selftests: livepatch: test-ftrace.sh
>
>                                       [48/1865]
> [14936.262721] livepatch: failed to register ftrace handler for
> function 'cmdline_proc_show' (-16)
> # TEST: livepatch interaction with ftrace_enabled sysctl ...

...

> I think it is probably because we skip mem* functions here.

I did not test livepatch which is a separate new feature,
let me try it, maybe it needs some time because I am very
busy with some other stuffs.

Thanks,
Tiezhu