[PATCH v5 0/2] docs: checkpatch: improve handling of Co-developed-by

[Sean Christopherson <sean.j.christopherson@intel.com>]

The recently introduced Co-developed-by: tag has seen a spate of
improper usage, likely because the tag is less intuitive and slightly
more complex than most other tags.  Rework the documentation to be more
explicit in how Co-developed-by: is intended to be used, add examples
in the docs, and add logic to checkpatch to reinforce proper usage.

v1: https://lkml.kernel.org/r/20190320151140.32432-1-sean.j.christopherson@intel.com
v2: https://lkml.kernel.org/r/20190321184316.8525-1-sean.j.christopherson@intel.com
    Rewrite the blurb to state standard sign-off procedure should be
    followed as opposed to dictating the original author's SOB be last.
v3: https://lkml.kernel.org/r/20190321200103.9333-1-sean.j.christopherson@intel.com
    Update a similar blurb in Documentation/process/5.Posting.rst
v4: https://lkml.kernel.org/r/20190322155735.13954-1-sean.j.christopherson@intel.com
    Rework the blurbs to avoid use of the word "original" [Tobin]
v5: Add checkpatch warnings [Joe]
    Fix a spelling error [Niklas]

Sean Christopherson (2):
  docs: Clarify the usage and sign-off requirements for Co-developed-by
  checkpatch: Warn on improper usage of Co-developed-by

 Documentation/process/5.Posting.rst          | 10 +++--
 Documentation/process/submitting-patches.rst | 40 +++++++++++++++++---
 scripts/checkpatch.pl                        | 18 +++++++++
 3 files changed, 59 insertions(+), 9 deletions(-)

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2.21.0