147 #define mem_barrier() __asm__ __volatile__ ("mfence" : : : "memory")  macro
149 #define mem_barrier() __asm__ __volatile__ ("lock; addl $0,0(%%esp)" : : : "memory")  macro
154 #define mem_barrier() __asm__ __volatile__ ("mb" : : : "memory")  macro
159 #define mem_barrier() __asm__ __volatile__ ("mfence" : : : "memory")  macro
165 #define mem_barrier()        __asm__ __volatile__ ("mf" : : : "memory")  macro
169 #define mem_barrier() __mf()  macro
175 #define mem_barrier()		\  macro
185 #define write_mem_barrier() mem_barrier()
192 #define mem_barrier()	eieio()  macro
198 #define mem_barrier()           /* XXX: nop for now */  macro
207 #ifndef mem_barrier
208 #define mem_barrier()           /* NOP */  macro
962     mem_barrier();  in xf86ReadMmio8()
969     mem_barrier();  in xf86ReadMmio16()
976     mem_barrier();  in xf86ReadMmio32()