Re: [PATCH v5 0/8] Add objtool and orc support for LoongArch

[Tiezhu Yang]

On 12/02/2023 09:52 PM, Huacai Chen wrote:
> Hi, Tiezhu,
>
> There are still some build warnings.
>
> If FUNCTION_TRACER enabled, we get
>   AS      arch/loongarch/kernel/mcount_dyn.o
> arch/loongarch/kernel/mcount_dyn.o: warning: objtool:
> ftrace_common+0x0: unreachable instruction
> arch/loongarch/kernel/mcount_dyn.o: warning: objtool:
> ftrace_caller+0x0: unreachable instruction
> arch/loongarch/kernel/mcount_dyn.o: warning: objtool:
> ftrace_regs_caller+0x0: unreachable instruction
> arch/loongarch/kernel/mcount_dyn.o: warning: objtool:
> ftrace_graph_caller+0x0: unreachable instruction
> arch/loongarch/kernel/mcount_dyn.o: warning: objtool:
> return_to_handler+0x0: unreachable instruction
> arch/loongarch/kernel/mcount_dyn.o: warning: objtool:
> ftrace_stub_direct_tramp+0x0: unreachable instruction
>
>   AS      arch/loongarch/kernel/rethook_trampoline.o
> arch/loongarch/kernel/rethook_trampoline.o: warning: objtool:
> arch_rethook_trampoline+0x0: unreachable instruction

I tested with the default config loongson3_defconfig,
the FUNCTION_TRACE is not enabled, let me try to fix it.

> And when I use the latest binutils/gcc for native build, there are
> some warnings in some files from the {init, kernel} directory. But
> cross-building is fine, I don't know why.

I can not reproduce it for native build, it works well,
I will analysis if it can reproduce someday.

Thanks,
Tiezhu