From: David S. Miller <davem@sunset.davemloft.net>
Date: Sun, 12 Feb 2006 07:22:47 +0000 (-0800)
Subject: [SPARC64]: Do not try to synchronize %stick registers on SUN4V.
X-Git-Tag: v2.6.17-rc1~1184^2~145
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02fead75055246d01af56a45a9d1b311d506da3e;p=linux-2.6

[SPARC64]: Do not try to synchronize %stick registers on SUN4V.

Writes by privileged code are not allowed.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index d637168ce3..2dbe008d6b 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -1278,7 +1278,11 @@ int __devinit __cpu_up(unsigned int cpu)
 		if (!cpu_isset(cpu, cpu_online_map)) {
 			ret = -ENODEV;
 		} else {
-			smp_synchronize_one_tick(cpu);
+			/* On SUN4V, writes to %tick and %stick are
+			 * not allowed.
+			 */
+			if (tlb_type != hypervisor)
+				smp_synchronize_one_tick(cpu);
 		}
 	}
 	return ret;