RE: [PATCH] qed: add missing header dependencies

quoted

While I obviously have no strong objection for including
qed_selftest.h from qed_selftest.c, I'm not sure I understand which C
standard dictates this requirement.
Why should a function definition [not call] be preceded by a prototype?

- When a function is defined in one file and used in another, you want
  both files to include the same header that has the declaration to
  ensure that the types are identical. There are cases where the
  prototype is changed after the fact in an incompatible way, causing
  silent data corruption on some configurations but maybe not on others.