diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-12-20 16:38:35 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-02-07 21:03:11 +1100 |
| commit | 830213786c498b0c488fedd2abc15a7ce442b42f (patch) | |
| tree | abf076819b956e490195f8e87c3c657265c788db /arch/powerpc/kernel/trace/ftrace.c | |
| parent | 0c81ed5ed43863d313cf253b0ebada6ea2f17676 (diff) | |
powerpc/ftrace: directly call of function graph tracer by ftrace caller
Modify function graph tracer to be handled directly by the standard
ftrace caller.
This is made possible as powerpc now supports
CONFIG_DYNAMIC_FTRACE_WITH_ARGS.
This change simplifies the call of function graph ftrace.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/04d196585ff81bde06a000bd9c633a33a5b21130.1640017960.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/trace/ftrace.c')
| -rw-r--r-- | arch/powerpc/kernel/trace/ftrace.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c index ce673764cb69..74a176e394ef 100644 --- a/arch/powerpc/kernel/trace/ftrace.c +++ b/arch/powerpc/kernel/trace/ftrace.c @@ -917,6 +917,9 @@ static int ftrace_modify_ftrace_graph_caller(bool enable) unsigned long stub = (unsigned long)(&ftrace_graph_stub); ppc_inst_t old, new; + if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_ARGS)) + return 0; + old = ftrace_call_replace(ip, enable ? stub : addr, 0); new = ftrace_call_replace(ip, enable ? addr : stub, 0); @@ -955,6 +958,14 @@ unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip, out: return parent; } + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs) +{ + fregs->regs.link = prepare_ftrace_return(parent_ip, ip, fregs->regs.gpr[1]); +} +#endif #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ #ifdef PPC64_ELF_ABI_v1 |