From 9179634596a53d7a15aaf2be4aabc30d3db1512a Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Mon, 24 Nov 2014 14:58:17 -0500 Subject: [PATCH] ftrace/x86: Have static function tracing always test for function graph New updates to the ftrace generic code had ftrace_stub not always being called when ftrace is off. This causes the static tracer to always save and restore functions. But it also showed that when function tracing is running, the function graph tracer can not. We should always check to see if function graph tracing is running even if the function tracer is running too. The function tracer code is not the only one that uses the hook to function mcount. Cc: Markos Chandras Signed-off-by: Steven Rostedt --- arch/x86/kernel/mcount_64.S | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/mcount_64.S b/arch/x86/kernel/mcount_64.S index 35a793fa4bba7..6dc134b8dc70c 100644 --- a/arch/x86/kernel/mcount_64.S +++ b/arch/x86/kernel/mcount_64.S @@ -194,6 +194,7 @@ ENTRY(function_hook) cmpq $ftrace_stub, ftrace_trace_function jnz trace +fgraph_trace: #ifdef CONFIG_FUNCTION_GRAPH_TRACER cmpq $ftrace_stub, ftrace_graph_return jnz ftrace_graph_caller @@ -220,7 +221,7 @@ trace: MCOUNT_RESTORE_FRAME - jmp ftrace_stub + jmp fgraph_trace END(function_hook) #endif /* CONFIG_DYNAMIC_FTRACE */ #endif /* CONFIG_FUNCTION_TRACER */ -- 2.39.5