examples/vm_power: use compiler atomics for sync

Convert rte_atomic32_cmpset to compiler atomic CAS
operation for channel status sync.

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>

diff --git a/examples/vm_power_manager/channel_monitor.c b/examples/vm_power_manager/channel_monitor.c
index f03102e..d767423 100644 (file)
--- a/examples/vm_power_manager/channel_monitor.c
+++ b/examples/vm_power_manager/channel_monitor.c
@@ -25,7 +25,6 @@
 #include <rte_log.h>
 #include <rte_memory.h>
 #include <rte_malloc.h>
-#include <rte_atomic.h>
 #include <rte_cycles.h>
 #include <rte_ethdev.h>
 #ifdef RTE_NET_I40E
@@ -827,8 +826,9 @@ process_request(struct rte_power_channel_packet *pkt,
        if (chan_info == NULL)
                return -1;
 
-       if (rte_atomic32_cmpset(&(chan_info->status), CHANNEL_MGR_CHANNEL_CONNECTED,
-                       CHANNEL_MGR_CHANNEL_PROCESSING) == 0)
+       uint32_t channel_connected = CHANNEL_MGR_CHANNEL_CONNECTED;
+       if (__atomic_compare_exchange_n(&(chan_info->status), &channel_connected,
+               CHANNEL_MGR_CHANNEL_PROCESSING, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED) == 0)
                return -1;
 
        if (pkt->command == RTE_POWER_CPU_POWER) {
@@ -932,8 +932,9 @@ process_request(struct rte_power_channel_packet *pkt,
         * Return is not checked as channel status may have been set to DISABLED
         * from management thread
         */
-       rte_atomic32_cmpset(&(chan_info->status), CHANNEL_MGR_CHANNEL_PROCESSING,
-                       CHANNEL_MGR_CHANNEL_CONNECTED);
+       uint32_t channel_processing = CHANNEL_MGR_CHANNEL_PROCESSING;
+       __atomic_compare_exchange_n(&(chan_info->status), &channel_processing,
+               CHANNEL_MGR_CHANNEL_CONNECTED, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
        return 0;
 
 }