linux-kernel - Re: fs/btrfs/lzo.o: warning: objtool: lzo_compress

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Message-ID: <fbe7c1cd-ff4f-4252-baf2-88d3c5e50fdc@suse.com>
Date: Wed, 24 Jul 2024 11:45:42 +0930
From: Qu Wenruo <wqu@...e.com>
To: Philip Li <philip.li@...el.com>, kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 David Sterba <dsterba@...e.com>
Subject: Re: fs/btrfs/lzo.o: warning: objtool: lzo_compress_folios+0xb0:
 unreachable instruction



在 2024/7/24 11:32, Philip Li 写道:
> On Tue, Jul 23, 2024 at 08:18:41PM +0800, kernel test robot wrote:
>> Hi Qu,
>>
>> FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   66ebbdfdeb093e097399b1883390079cd4c3022b
>> commit: 400b172b8cdcff87038697169fe9e4222120dd9a btrfs: compression: migrate compression/decompression paths to folios
>> date:   3 months ago
>> config: loongarch-randconfig-001-20240722 (https://download.01.org/0day-ci/archive/20240723/202407232006.7Gelsbv4-lkp@intel.com/config)
>> compiler: loongarch64-linux-gcc (GCC) 14.1.0
>> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240723/202407232006.7Gelsbv4-lkp@intel.com/reproduce)
>>
>> If you fix the issue in a separate patch/commit (i.e. not just a new version of
>> the same patch/commit), kindly add following tags
>> | Reported-by: kernel test robot <lkp@...el.com>
>> | Closes: https://lore.kernel.org/oe-kbuild-all/202407232006.7Gelsbv4-lkp@intel.com/
>>
>> All warnings (new ones prefixed by >>):
> 
> Sorry, kindly ignore this report which could be related to tool chain upgrade to
> loongarch64-linux-gcc (GCC) 14.1.0.
> 
> We will further check whether the issue can be reproduced on gcc-13.

Gcc 14.1 is totally fine, as that's the version I'm using already 
(although a little newer, 14.1.1)

It would be even better to focus on more common architectures first 
(x86_64, aarch64), and put a lower priority on less common architectures.

As most developers are not really able to access those platforms easily.

Thanks,
Qu

> 
>>
>>>> fs/btrfs/lzo.o: warning: objtool: lzo_compress_folios+0xb0: unreachable instruction
>>     fs/btrfs/lzo.o: warning: objtool: lzo_decompress_bio+0x140: unreachable instruction
>>
>>
>> objdump-func vmlinux.o lzo_compress_folios:
>>
>> -- 
>> 0-DAY CI Kernel Test Service
>> https://github.com/intel/lkp-tests/wiki
>>