Re: [akpm-mm:mm-nonmm-unstable 66/67] fs/ocfs2/aops.c:1133:17: warning: variable 'i' is uninitialized when used here

[Andrew Morton <akpm@linux-foundation.org>]

On Tue, 22 Apr 2025 13:12:41 -0700 Nathan Chancellor <nathan@kernel.org> wrote:

> Hi Andrew,
> 
> On Sat, Apr 19, 2025 at 09:21:13AM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
> > head:   d1a9b961293d30be9a865d8685590635db282957
> > commit: 89e3e963129e945e0333e474709bde627b6a9cee [66/67] ocfs2: fix panic in failed foilio allocation
> > config: s390-randconfig-001-20250419 (https://download.01.org/0day-ci/archive/20250419/202504190950.rq1NDlDz-lkp@intel.com/config)
> > compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250419/202504190950.rq1NDlDz-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@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202504190950.rq1NDlDz-lkp@intel.com/
> > 
> > All warnings (new ones prefixed by >>):
> > 
> > >> fs/ocfs2/aops.c:1133:17: warning: variable 'i' is uninitialized when used here [-Wuninitialized]
> >     1133 |                         wc->w_folios[i] = NULL;
> >          |                                      ^
> >    fs/ocfs2/aops.c:1101:12: note: initialize the variable 'i' to silence this warning
> >     1101 |         int ret, i;
> >          |                   ^
> >          |                    = 0
> 
> There appears to be something funky going on with "ocfs2: fix panic in
> failed foilio allocation" in your tree, perhaps as a result of applying
> v2 to mm-nonmm-unstable and v1 to mm-hotfixes-unstable? If you compare
> https://git.kernel.org/akpm/mm/c/392a664f6d2740eeae23df0d29b56f444f558a7c
> to https://lore.kernel.org/c879a52b-835c-4fa0-902b-8b2e9196dcbd@oracle.com/,
> the second hunks do not match, which is what this is warning about. I
> see this same warning in next-20250422.

Thanks.  Confirms that the universe is a plot to confuse akpm.

I dropped everything and remerged the v2 patch.