Re: [PATCH v4 8/8] LoongArch: Add ORC stack unwinder support

[Tiezhu Yang]

On 10/23/2023 04:43 PM, Xi Ruoyao wrote:
> On Mon, 2023-10-23 at 16:11 +0800, Tiezhu Yang wrote:
> > +ifdef CONFIG_OBJTOOL
> > +KBUILD_CFLAGS			+= -fno-optimize-sibling-calls -fno-jump-tables -falign-functions=4
> > +endif
>
> Why do we need to regress the code generation so much for objtool?

Add the above options is to avoid generating some intractable
instructions for objtool by now, I hope all of the extra options
can be removed if possible.

For example, without -fno-jump-tables, there exist many objtool
warnings like this:

"sibling call from callable instruction with modified stack frame"

If the enhanced special function about jump table is implemented
in objtool, -fno-jump-tables will be removed in the future.

Thanks,
Tiezhu