diff options
Diffstat (limited to 'arch/s390/kernel/mcount64.S')
| -rw-r--r-- | arch/s390/kernel/mcount64.S | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/s390/kernel/mcount64.S b/arch/s390/kernel/mcount64.S index c67a8bf0fd9a..5b33c83adde9 100644 --- a/arch/s390/kernel/mcount64.S +++ b/arch/s390/kernel/mcount64.S @@ -32,14 +32,17 @@ ENTRY(ftrace_caller) lg %r14,0(%r14) basr %r14,%r14 #ifdef CONFIG_FUNCTION_GRAPH_TRACER +# The j instruction gets runtime patched to a nop instruction. +# See ftrace_enable_ftrace_graph_caller. The patched instruction is: +# j .+4 +ENTRY(ftrace_graph_caller) + j ftrace_graph_caller_end lg %r2,168(%r15) lg %r3,272(%r15) -ENTRY(ftrace_graph_caller) -# 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: stg %r2,168(%r15) + brasl %r14,prepare_ftrace_return + stg %r2,168(%r15) +ftrace_graph_caller_end: + .globl ftrace_graph_caller_end #endif aghi %r15,160 lmg %r2,%r5,32(%r15) |