linux-kernel - Re: fs/btrfs/inode.o: warning: objtool: insert_inline

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Message-ID: <8afac96c-979e-47b4-8416-c26ba4c4a348@suse.com>
Date: Tue, 23 Jul 2024 15:07:54 +0930
From: Qu Wenruo <wqu@...e.com>
To: 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/inode.o: warning: objtool: insert_inline_extent+0xa8:
 unreachable instruction

Hi LKP team,

Thanks a lot of your reports.

在 2024/7/23 15:02, kernel test robot 写道:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   66ebbdfdeb093e097399b1883390079cd4c3022b
> commit: eb1fa9ab470285d39bee268bc2a90d1786610711 btrfs: make insert_inline_extent() accept one page directly
> date:   3 months ago
> config: loongarch-randconfig-001-20240722 (https://download.01.org/0day-ci/archive/20240723/202407231331.vNHHJPnu-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/20240723/202407231331.vNHHJPnu-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/202407231331.vNHHJPnu-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>>> fs/btrfs/inode.o: warning: objtool: insert_inline_extent+0xa8: unreachable instruction

However for those not-so-common archs, mind to provide the code line 
number if possible?
(Better for all archs)

Although unreachable instruction warning is mostly false alerts, I still 
want to be sure.

Thanks,
Qu
>     fs/btrfs/inode.o: warning: objtool: btrfs_del_delalloc_inode+0xb0: unreachable instruction
>     fs/btrfs/inode.o: warning: objtool: btrfs_set_delalloc_extent+0x18c: unreachable instruction
>     fs/btrfs/inode.o: warning: objtool: btrfs_evict_inode+0x9c: unreachable instruction
>     fs/btrfs/inode.o: warning: objtool: btrfs_get_extent+0x3d0: unreachable instruction
>     fs/btrfs/inode.o: warning: objtool: btrfs_set_range_writeback+0x7c: unreachable instruction
>     fs/btrfs/inode.o: warning: objtool: compress_file_range+0x388: unreachable instruction
>     fs/btrfs/inode.o: warning: objtool: cow_file_range+0x128: unreachable instruction
>     fs/btrfs/inode.o: warning: objtool: btrfs_finish_one_ordered+0x174: unreachable instruction
>     fs/btrfs/inode.o: warning: objtool: btrfs_invalidate_folio+0x1b8: unreachable instruction
> 
> 
> objdump-func vmlinux.o insert_inline_extent:
>