linux-kernel - Re: [PATCH 0/2] Fix objtool warnings if LTO is enabled for LoongArch

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Message-ID: <80f3c9ff-5949-b8d3-6067-18090e7a282a@loongson.cn>
Date: Mon, 18 Aug 2025 11:48:40 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>, Nathan Chancellor <nathan@...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 0/2] Fix objtool warnings if LTO is enabled for LoongArch

On 2025/8/16 下午10:59, Huacai Chen wrote:
> On Fri, Aug 15, 2025 at 7:01 AM Nathan Chancellor <nathan@...nel.org> wrote:
>>
>> On Tue, Aug 12, 2025 at 09:27:14PM +0800, Tiezhu Yang wrote:
>>> The patch #1 should be a preparation for patch #2, that is to say,
>>> the patch #2 is dependent on the patch #1, otherwise there is build
>>> error if LTO is enabled after only applying patch #2.
>>
>> Thanks, these two patches do indeed resolve most of the warnings that I
>> see.
>>
>> Tested-by: Nathan Chancellor <nathan@...nel.org>
>>
>>> With this series, most of warnings have been silenced, only remains
>>> the following warning by now, it needs more analysis:
>>>
>>>    vmlinux.o: warning: objtool: __efistub_efi_boot_kernel() falls through
>>>    to next function __efistub_exit_boot_func()
>>
>> Yes, I do see this one too. Odd, as efi_boot_kernel() ends in a
>> __noreturn function...
> But this one only exists for LTO?

Yes, this is true.

I have fixed this warning and the other new warnings locally,
will do more testing before sending patches.

Thanks,
Tiezhu