From c7de8624abae3b30ccfc77236d8c48e696ab6535 Mon Sep 17 00:00:00 2001
From: Steven Rostedt <rostedt@goodmis.org>
Date: Wed, 22 Dec 2010 16:42:56 +0000
Subject: [PATCH] --- yaml --- r: 232044 b: refs/heads/master c:
 06ca2188eccbd7932636ac5bde2837297800480e h: refs/heads/master v: v3

---
 [refs]                               |  2 +-
 trunk/arch/powerpc/kernel/entry_32.S | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 275f645e33b3..2684cbbf052e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3cb5f1a3e58c0bd70d47d9907cc5c65192281dee
+refs/heads/master: 06ca2188eccbd7932636ac5bde2837297800480e
diff --git a/trunk/arch/powerpc/kernel/entry_32.S b/trunk/arch/powerpc/kernel/entry_32.S
index c22dc1ec1c94..56212bc0ab08 100644
--- a/trunk/arch/powerpc/kernel/entry_32.S
+++ b/trunk/arch/powerpc/kernel/entry_32.S
@@ -880,7 +880,18 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
 	 */
 	andi.	r10,r9,MSR_EE
 	beq	1f
+	/*
+	 * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
+	 * which is the stack frame here, we need to force a stack frame
+	 * in case we came from user space.
+	 */
+	stwu	r1,-32(r1)
+	mflr	r0
+	stw	r0,4(r1)
+	stwu	r1,-32(r1)
 	bl	trace_hardirqs_on
+	lwz	r1,0(r1)
+	lwz	r1,0(r1)
 	lwz	r9,_MSR(r1)
 1:
 #endif /* CONFIG_TRACE_IRQFLAGS */