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

[Tiezhu Yang]

On 12/02/2023 09:45 PM, Huacai Chen wrote:
> Hi, Tiezhu,
>
> 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/kernel/lbt.S b/arch/loongarch/kernel/lbt.S
> > index 9c75120a26d8..4d6914f84c7e 100644
> > --- a/arch/loongarch/kernel/lbt.S
> > +++ b/arch/loongarch/kernel/lbt.S
> > @@ -11,6 +11,7 @@
> >  #include <asm/asm-offsets.h>
> >  #include <asm/errno.h>
> >  #include <asm/regdef.h>
> > +#include <asm/unwind_hints.h>
> >
> >  #define SCR_REG_WIDTH 8
> >
> > @@ -153,3 +154,7 @@ SYM_FUNC_END(_restore_ftop_context)
> >  .L_lbt_fault:
> >         li.w            a0, -EFAULT             # failure
> >         jr              ra
> > +
> > +#ifdef CONFIG_CPU_HAS_LBT
> > +STACK_FRAME_NON_STANDARD _restore_ftop_context
> > +#endif
> This file is only compiled if CONFIG_CPU_HAS_LBT is set, so #ifdef can
> be removed.

OK, will remove it in the next version.

Thanks,
Tiezhu