+#ifdef __SUBARCH_HAS_LWSYNC
+#    define SMPWMB      lwsync
+#else
+#    define SMPWMB      eieio
+#endif
+
 #define smp_mb()	mb()
 #define smp_rmb()	rmb()
-#define smp_wmb()	eieio()
+#define smp_wmb()	__asm__ __volatile__ (__stringify(SMPWMB) : : 
:"memory")

SMPWMB is used only here.  Why not just

#ifdef __SUBARCH_HAS_LWSYNC
#define smp_wmb() lwsync()
#else
#define smp_wmb() eieio()
#endif

?


Segher