Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...

[pandora-kernel.git] / arch / powerpc / kernel / entry_32.S

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index c22dc1e..56212bc 100644 (file)
--- a/arch/powerpc/kernel/entry_32.S
+++ b/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 */