linux-kernel - Re: fs/overlayfs/copy_up.o: warning: objtool: ovl_copy_up_tmpfile() falls through to next function ovl_create

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Date: Tue, 27 Feb 2024 15:56:53 +0200
From: Amir Goldstein <amir73il@...il.com>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	overlayfs <linux-unionfs@...r.kernel.org>, Miklos Szeredi <miklos@...redi.hu>
Subject: Re: fs/overlayfs/copy_up.o: warning: objtool: ovl_copy_up_tmpfile()
 falls through to next function ovl_create_index.cold()

On Sun, Feb 25, 2024 at 11:25 PM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   70ff1fe626a166dcaadb5a81bfe75e22c91f5dbf
> commit: 5b02bfc1e7e3811c5bf7f0fa626a0694d0dbbd77 ovl: do not encode lower fh with upper sb_writers held
> date:   4 months ago
> config: x86_64-buildonly-randconfig-r001-20230616 (https://download.01.org/0day-ci/archive/20240226/202402260556.0rujs05e-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240226/202402260556.0rujs05e-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/202402260556.0rujs05e-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> >> fs/overlayfs/copy_up.o: warning: objtool: ovl_copy_up_tmpfile() falls through to next function ovl_create_index.cold()
>

I have no idea what this is about.
Does not seem related to the regressing commit.
This:
https://lore.kernel.org/lkml/caa4ec6c687931db805e692d4e4bf06cd87d33e6.1460729697.git.jpoimboe@redhat.com/
suggest that it might be a compiler bug?

Thanks,
Amir.