[S390] cleanup ftrace backend functions
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
index 4a6e1a5..1e6a557 100644
--- a/arch/s390/kernel/mcount.S
+++ b/arch/s390/kernel/mcount.S
@@ -18,22 +18,12 @@
#ifdef CONFIG_DYNAMIC_FTRACE
br %r14
- .data
- .globl ftrace_dyn_func
-ftrace_dyn_func:
- .long ftrace_stub
- .previous
-
.globl ftrace_caller
ftrace_caller:
#endif
stm %r2,%r5,16(%r15)
bras %r1,2f
-#ifdef CONFIG_DYNAMIC_FTRACE
-0: .long ftrace_dyn_func
-#else
0: .long ftrace_trace_function
-#endif
1: .long function_trace_stop
2: l %r2,1b-0b(%r1)
icm %r2,0xf,0(%r2)
@@ -49,21 +39,15 @@
l %r14,0(%r14)
basr %r14,%r14
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-#ifdef CONFIG_DYNAMIC_FTRACE
+ l %r2,100(%r15)
+ l %r3,152(%r15)
.globl ftrace_graph_caller
ftrace_graph_caller:
- # This unconditional branch gets runtime patched. Change only if
- # you know what you are doing. See ftrace_enable_graph_caller().
- j 1f
-#endif
- bras %r1,0f
- .long prepare_ftrace_return
-0: l %r2,152(%r15)
- l %r4,0(%r1)
- l %r3,100(%r15)
- basr %r14,%r4
- st %r2,100(%r15)
-1:
+# The bras instruction gets runtime patched to call prepare_ftrace_return.
+# See ftrace_enable_ftrace_graph_caller. The patched instruction is:
+# bras %r14,prepare_ftrace_return
+ bras %r14,0f
+0: st %r2,100(%r15)
#endif
ahi %r15,96
l %r14,56(%r15)