X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_eal%2Fcommon%2Finclude%2Farch%2Fx86%2Frte_atomic_64.h;h=fd2ec9c537965ff28d8c381da1225311d41eeee8;hb=ff2863570fcc;hp=1a53a766bd729f465032ba24dc3da2caabb8a35e;hpb=adeb2a2d572bdadb44466b874556682f480681dc;p=dpdk.git

diff --git a/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h b/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
index 1a53a766bd..fd2ec9c537 100644
--- a/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
@@ -71,6 +71,18 @@ rte_atomic64_cmpset(volatile uint64_t *dst, uint64_t exp, uint64_t src)
 	return res;
 }
 
+static inline uint64_t
+rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val)
+{
+	asm volatile(
+			MPLOCKED
+			"xchgq %0, %1;"
+			: "=r" (val), "=m" (*dst)
+			: "0" (val),  "m" (*dst)
+			: "memory");         /* no-clobber list */
+	return val;
+}
+
 static inline void
 rte_atomic64_init(rte_atomic64_t *v)
 {