powerpc64, tracing: add function graph tracer with dynamic tracing

This is the port of the function graph tracer to PowerPC with
dynamic tracing.

Geoff Lavand tested on PS3.

Tested-by: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index a32699e74c3c..9f61fd61f277 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -908,6 +908,12 @@ _GLOBAL(ftrace_caller)
 ftrace_call:
         bl      ftrace_stub
         nop
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+.globl ftrace_graph_call
+ftrace_graph_call:
+        b       ftrace_graph_stub
+_GLOBAL(ftrace_graph_stub)
+#endif
         ld      r0, 128(r1)
         mtlr    r0
         addi    r1, r1, 112
@@ -946,7 +952,7 @@ _GLOBAL(ftrace_stub)
 #endif /* CONFIG_DYNAMIC_FTRACE */
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
-ftrace_graph_caller:
+_GLOBAL(ftrace_graph_caller)
         /* load r4 with local address */
         ld      r4, 128(r1)
         subi    r4, r4, MCOUNT_INSN_SIZE