30  *           a: smp_mb()
32  *           c: smp_mb()
69  *           a: smp_mb()
71  *           c: smp_mb()
89  *           a: smp_mb()
93  *           c: smp_mb()
109  *             a: smp_mb()
111  *                                             d: smp_mb()
114  *             c: smp_mb()
123  *           a: smp_mb()
125  *                                             d: smp_mb()
130  *                                             g: smp_mb()
131  *           c: smp_mb()
172 	smp_mb();	/* IPIs should be serializing but paranoid. */  in ipi_mb()
178 	 * The smp_mb() in membarrier after all the IPIs is supposed to  in ipi_sync_core()
185 	 * after membarrier()'s smp_mb().  in ipi_sync_core()
187 	smp_mb();	/* IPIs should be serializing but paranoid. */  in ipi_sync_core()
198 	 * time we've already sent an IPI, the cost of the extra smp_mb()  in ipi_rseq()
201 	smp_mb();  in ipi_rseq()
228 	smp_mb();  in ipi_sync_rq_state()
238 	smp_mb();  in membarrier_exec_mmap()
271 	smp_mb();	/* system call entry is not a mb. */  in membarrier_global_expedited()
321 	smp_mb();	/* exit from system call is not a mb */  in membarrier_global_expedited()
365 	smp_mb();	/* system call entry is not a mb. */  in membarrier_private_expedited()
408 		 * skipping the current cpu -- we're about to do smp_mb()  in membarrier_private_expedited()
442 	smp_mb();	/* exit from system call is not a mb */  in membarrier_private_expedited()
463 		smp_mb();  in sync_runqueues_membarrier_state()
625  * smp_mb() to represent explicit memory barriers forcing full memory
627  * each pair of barrier(), sys_membarrier() and smp_mb():
631  *                        barrier()   smp_mb() sys_membarrier()
633  *        smp_mb()           X           O            O