diff options
Diffstat (limited to 'arch/s390/kernel/mcount.S')
| -rw-r--r-- | arch/s390/kernel/mcount.S | 30 |
1 files changed, 7 insertions, 23 deletions
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S index 4a6e1a575f9e..1e6a55795628 100644 --- a/arch/s390/kernel/mcount.S +++ b/arch/s390/kernel/mcount.S @@ -18,22 +18,12 @@ _mcount: #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 @@ ftrace_caller: 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) |