From 91f0190a07fa4c1fec97838ffc690b84102168a9 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 9 Jul 2010 15:30:22 +1000
Subject: [PATCH] --- yaml --- r: 204711 b: refs/heads/master c:
 e8775d4aa17d70d123814e68a6a51bbea50e5c16 h: refs/heads/master i:   204709:
 96dd7273a85efb128649387ac448806482f87979   204707:
 a9313a390671c7ce51517e15d491c0201b01bef9   204703:
 d446ef1c603b73968dd812291f589d81f1a9ca31 v: v3

---
 [refs]                          | 2 +-
 trunk/arch/powerpc/kernel/irq.c | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 737ad7d161d9..36efaa720b26 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b9f1cd71dbf21a91fb7e2336a1d1ff18b97771e5
+refs/heads/master: e8775d4aa17d70d123814e68a6a51bbea50e5c16
diff --git a/trunk/arch/powerpc/kernel/irq.c b/trunk/arch/powerpc/kernel/irq.c
index 77be3d058a65..fa6f38525801 100644
--- a/trunk/arch/powerpc/kernel/irq.c
+++ b/trunk/arch/powerpc/kernel/irq.c
@@ -159,8 +159,17 @@ notrace void raw_local_irq_restore(unsigned long en)
 	 * use local_paca instead of get_paca() to avoid preemption checking.
 	 */
 	local_paca->hard_enabled = en;
+
+#ifndef CONFIG_BOOKE
+	/* On server, re-trigger the decrementer if it went negative since
+	 * some processors only trigger on edge transitions of the sign bit.
+	 *
+	 * BookE has a level sensitive decrementer (latches in TSR) so we
+	 * don't need that
+	 */
 	if ((int)mfspr(SPRN_DEC) < 0)
 		mtspr(SPRN_DEC, 1);
+#endif /* CONFIG_BOOKE */
 
 	/*
 	 * Force the delivery of pending soft-disabled interrupts on PS3.