[DPDK/ethdev Bug 1809] net/intel: possible misuse of comma operator

[bugzilla at dpdk.org]

http://bugs.dpdk.org/show_bug.cgi?id=1809

            Bug ID: 1809
           Summary: net/intel: possible misuse of comma operator
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: stephen at networkplumber.org
  Target Milestone: ---

If DPDK is built with clang and -Wcomma is enabled for drivers then:

[1127/3622] Compiling C object
drivers/libtmp_rte_net_ice.a.p/net_intel_ice_ice_ethdev.c.o
../drivers/net/intel/ice/ice_ethdev.c:945:52: warning: possible misuse of comma
operator here [-Wcomma]
  945 |              entry && (next_entry = LIST_NEXT(entry, next), 1);
      |                                                           ^
../drivers/net/intel/ice/ice_ethdev.c:945:17: note: cast expression to void to
silence warning
  945 |              entry && (next_entry = LIST_NEXT(entry, next), 1);
      |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                        (void)(                            )
../drivers/net/intel/ice/ice_ethdev.c:952:52: warning: possible misuse of comma
operator here [-Wcomma]
  952 |              entry && (next_entry = LIST_NEXT(entry, next), 1);
      |                                                           ^
../drivers/net/intel/ice/ice_ethdev.c:952:17: note: cast expression to void to
silence warning
  952 |              entry && (next_entry = LIST_NEXT(entry, next), 1);
      |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                        (void)(                            )
2 warnings generated.
[1150/3622] Compiling C object
drivers/libtmp_rte_net_i40e.a.p/net_intel_i40e_i40e_ethdev.c.o
../drivers/net/intel/i40e/i40e_ethdev.c:5102:49: warning: possible misuse of
comma operator here [-Wcomma]
 5102 |                         entry && (next_entry = LIST_NEXT(entry, next),
1);
      |                                                                      ^
../drivers/net/intel/i40e/i40e_ethdev.c:5102:14: note: cast expression to void
to silence warning
 5102 |                         entry && (next_entry = LIST_NEXT(entry, next),
1);
      |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                   (void)(                            )
../drivers/net/intel/i40e/i40e_ethdev.c:5109:49: warning: possible misuse of
comma operator here [-Wcomma]
 5109 |                         entry && (next_entry = LIST_NEXT(entry, next),
1);
      |                                                                      ^
../drivers/net/intel/i40e/i40e_ethdev.c:5109:14: note: cast expression to void
to silence warning
 5109 |                         entry && (next_entry = LIST_NEXT(entry, next),
1);
      |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                   (void)(                            )
2 warnings generated.


Suggest looking at how LIST_NEXT could be changed to not generate warnings, not
seen elsewhere.

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