[linux-next:master 5025/9010] tcp_mmap.c:211:61: warning: 'lu' may be used uninitialized in this function

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   6a53bda3aaf3de5edeea27d0b1d8781d067640b6
commit: 5c5945dc695c54f2b55a934a10b6c4e220f9c140 [5025/9010] selftests/net: Add SHA256 computation over data sent in tcp_mmap
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=5c5945dc695c54f2b55a934a10b6c4e220f9c140
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 5c5945dc695c54f2b55a934a10b6c4e220f9c140
        make O=/tmp/kselftest headers
        make O=/tmp/kselftest -C tools/testing/selftests

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304042104.UFIuevBp-lkp@intel.com/

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   tcp_mmap.c: In function 'child_thread':
>> tcp_mmap.c:211:61: warning: 'lu' may be used uninitialized in this function [-Wmaybe-uninitialized]
     211 |                         zc.length = min(chunk_size, FILE_SZ - lu);
         |                                                             ^

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