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

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Date:   Thu, 7 Dec 2023 15:14:19 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/8] Add objtool and orc support for LoongArch



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