Re: [PATCH 1/3] btrfs: zlib: fix and simplify the inline extent decompression

[David Sterba <dsterba@suse.cz>]

On Tue, Jan 09, 2024 at 11:02:54AM +0800, kernel test robot wrote:
> Hi Qu,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on kdave/for-next]
> [also build test WARNING on next-20240108]
> [cannot apply to linus/master v6.7]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Qu-Wenruo/btrfs-zlib-fix-and-simplify-the-inline-extent-decompression/20240108-171206
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
> patch link:    https://lore.kernel.org/r/29b7793e53e1cdd559ad212ee69cec211a3b4db2.1704704328.git.wqu%40suse.com
> patch subject: [PATCH 1/3] btrfs: zlib: fix and simplify the inline extent decompression
> config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20240109/202401091012.pLm6PcKG-lkp@intel.com/config)
> compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240109/202401091012.pLm6PcKG-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/202401091012.pLm6PcKG-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> fs/btrfs/zlib.c:402:15: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
>      401 |                 pr_warn_ratelimited("BTRFS: infalte failed, decompressed=%lu expected=%lu\n",
>          |                                                                                       ~~~
>          |                                                                                       %zu
>      402 |                                         to_copy, destlen);
>          |                                                  ^~~~~~~

Valid report but I can't reproduce it. Built with clang 17 and
explicitly enabled -Wformat. We have additional warnings enabled per
directory fs/btrfs/ so we can add -Wformat, I'd like to know what I'm
missing, we've had fixups for the size_t printk format so it would make
sense to catch it early.