[dpdk-dev] [PATCH v2] eal/ppc: fix 64 bit atomic exchange operation

[David Christensen <drc@linux.vnet.ibm.com>]

The rte_atomic64_exchange operation for ppc_64 incorrectly linked
back to a 32 bit generic operation (__atomic_exchange_4) rather than
the 64 bit generic operation (__atomic_exchange_8).  As a result,
applications that used rte_eth_link_get_nowait() would only receive
the link speed, they would not receive the link state, link duplex,
or link autoneg properties.

Fixes: ff2863570f ("eal: introduce atomic exchange operation")
Cc: sthemmin@microsoft.com"
Cc: stable@dpdk.org

Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>
---
v2:
* Modified the subject line to better describe the change

 lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h b/lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h
index b13a80de4..7e3e13118 100644
--- a/lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h
+++ b/lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h
@@ -401,7 +401,7 @@ static inline void rte_atomic64_clear(rte_atomic64_t *v)
 static inline uint64_t
 rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val)
 {
-	return __atomic_exchange_4(dst, val, __ATOMIC_SEQ_CST);
+	return __atomic_exchange_8(dst, val, __ATOMIC_SEQ_CST);
 }
 
 #endif
-- 
2.18.1