[PATCH v3 1/7] ring: replace rte atomics with GCC builtin atomics

[Tyler Retzlaff]

Replace the use of rte_atomic.h types and functions, instead use GCC
supplied C++11 memory model builtins.

Signed-off-by: Tyler Retzlaff <roret...@linux.microsoft.com>
---
 lib/ring/rte_ring_core.h        |  1 -
 lib/ring/rte_ring_generic_pvt.h | 12 ++++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/lib/ring/rte_ring_core.h b/lib/ring/rte_ring_core.h
index 82b2370..b9c7860 100644
--- a/lib/ring/rte_ring_core.h
+++ b/lib/ring/rte_ring_core.h
@@ -31,7 +31,6 @@
 #include <rte_config.h>
 #include <rte_memory.h>
 #include <rte_lcore.h>
-#include <rte_atomic.h>
 #include <rte_branch_prediction.h>
 #include <rte_memzone.h>
 #include <rte_pause.h>
diff --git a/lib/ring/rte_ring_generic_pvt.h b/lib/ring/rte_ring_generic_pvt.h
index 5acb6e5..caa4c74 100644
--- a/lib/ring/rte_ring_generic_pvt.h
+++ b/lib/ring/rte_ring_generic_pvt.h
@@ -92,8 +92,10 @@
                if (is_sp)
                        r->prod.head = *new_head, success = 1;
                else
-                       success = rte_atomic32_cmpset(&r->prod.head,
-                                       *old_head, *new_head);
+                       /* NOTE: review for potential ordering optimization */
+                       success = __atomic_compare_exchange_n(&r->prod.head,
+                                       old_head, *new_head, 0,
+                                       __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
        } while (unlikely(success == 0));
        return n;
 }
@@ -162,8 +164,10 @@
                        rte_smp_rmb();
                        success = 1;
                } else {
-                       success = rte_atomic32_cmpset(&r->cons.head, *old_head,
-                                       *new_head);
+                       /* NOTE: review for potential ordering optimization */
+                       success = __atomic_compare_exchange_n(&r->cons.head,
+                                       old_head, *new_head, 0,
+                                       __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
                }
        } while (unlikely(success == 0));
        return n;
-- 
1.8.3.1