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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 <Markos.Chandras@imgtec.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-11-24 14:58:17 -05:00 committed by Steven Rostedt
parent 1d70be34df
commit 62a207d748
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kernel/mcount_64.S
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@ -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 */