[PATCH] ppc64: use smp_mb and smp_wmb

[Anton Blanchard]

Hi,

Use smp_mb and smp_wmb. In particular smp_wmb is lighter weight than wmb.

Signed-off-by: Anton Blanchard <anton at samba.org>

Index: linux-2.6.12-rc2/arch/ppc64/kernel/smp.c
===================================================================
--- linux-2.6.12-rc2.orig/arch/ppc64/kernel/smp.c	2005-04-26 19:32:18.881307808 +1000
+++ linux-2.6.12-rc2/arch/ppc64/kernel/smp.c	2005-04-29 09:45:19.765332186 +1000
@@ -126,7 +126,7 @@
 	 * the processor will continue on to secondary_start
 	 */
 	paca[nr].cpu_start = 1;
-	mb();
+	smp_mb();
 }
 
 #endif /* CONFIG_PPC_MULTIPLATFORM */
@@ -258,7 +258,7 @@
 	}
 
 	call_data = &data;
-	wmb();
+	smp_wmb();
 	/* Send a message to all other CPUs and wait for them to respond */
 	smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_CALL_FUNCTION);
 
@@ -435,7 +435,7 @@
 
 	/* get the target out of it's holding state */
 	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
-	wmb();
+	smp_wmb();
 
 	while (!cpu_online(cpu))
 		cpu_relax();
@@ -451,7 +451,7 @@
 	int i;
 
 	for (i = 0; i < 100; i++) {
-		rmb();
+		smp_rmb();
 		if (per_cpu(cpu_state, cpu) == CPU_DEAD)
 			return;
 		msleep(100);
@@ -467,7 +467,7 @@
 	cpu = smp_processor_id();
 	printk(KERN_DEBUG "CPU%d offline\n", cpu);
 	__get_cpu_var(cpu_state) = CPU_DEAD;
-	wmb();
+	smp_wmb();
 	while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE)
 		cpu_relax();
 
@@ -519,7 +519,7 @@
 	 * be written out to main store before we release
 	 * the processor.
 	 */
-	mb();
+	smp_mb();
 
 	/* wake up cpus */
 	DBG("smp: kicking cpu %d\n", cpu);
Index: linux-2.6.12-rc2/arch/ppc64/kernel/time.c
===================================================================
--- linux-2.6.12-rc2.orig/arch/ppc64/kernel/time.c	2005-03-06 07:08:24.000000000 +1100
+++ linux-2.6.12-rc2/arch/ppc64/kernel/time.c	2005-04-29 09:45:19.769331880 +1000
@@ -221,15 +221,15 @@
 	temp_varp->tb_to_xs = do_gtod.varp->tb_to_xs;
 	temp_varp->tb_orig_stamp = new_tb_orig_stamp;
 	temp_varp->stamp_xsec = new_stamp_xsec;
-	mb();
+	smp_mb();
 	do_gtod.varp = temp_varp;
 	do_gtod.var_idx = temp_idx;
 
 	++(systemcfg->tb_update_count);
-	wmb();
+	smp_wmb();
 	systemcfg->tb_orig_stamp = new_tb_orig_stamp;
 	systemcfg->stamp_xsec = new_stamp_xsec;
-	wmb();
+	smp_wmb();
 	++(systemcfg->tb_update_count);
 }
 
@@ -648,7 +648,7 @@
 	temp_varp->tb_to_xs = new_tb_to_xs;
 	temp_varp->stamp_xsec = new_stamp_xsec;
 	temp_varp->tb_orig_stamp = do_gtod.varp->tb_orig_stamp;
-	mb();
+	smp_mb();
 	do_gtod.varp = temp_varp;
 	do_gtod.var_idx = temp_idx;
 
@@ -662,10 +662,10 @@
 	 * loops back and reads them again until this criteria is met.
 	 */
 	++(systemcfg->tb_update_count);
-	wmb();
+	smp_wmb();
 	systemcfg->tb_to_xs = new_tb_to_xs;
 	systemcfg->stamp_xsec = new_stamp_xsec;
-	wmb();
+	smp_wmb();
 	++(systemcfg->tb_update_count);
 
 	write_sequnlock_irqrestore( &xtime_lock, flags );