Hi Daniel,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Xu/Support-defragmenting-IPv4-packets-in-BPF/20221215-072858
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/fc37530d6cf954c3ebd1173d2bdc6b731c733134.1671049840.git.dxu%40dxuuu.xyz
patch subject: [PATCH bpf-next 2/6] bpf: verifier: Support KF_CHANGES_PKT flag
reproduce:
        # https://github.com/intel-lab-lkp/linux/commit/ca42b5d5e5d93debd023634aca7e206550fee180
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Daniel-Xu/Support-defragmenting-IPv4-packets-in-BPF/20221215-072858
        git checkout ca42b5d5e5d93debd023634aca7e206550fee180
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        make htmldocs

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> Documentation/bpf/kfuncs.rst:204: WARNING: Title underline too short.

vim +204 Documentation/bpf/kfuncs.rst

   202	
   203	2.4.9 KF_CHANGES_PKT flag
 > 204	-----------------
   205	

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