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arm64: Fix static use of function graph

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Function graph does not work currently when CONFIG_DYNAMIC_TRACE is not
set. This is because ftrace_function_trace is not always set to ftrace_stub
when function_graph is in use.

Do not skip checking of graph tracer functions when ftrace_function_trace
is set.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Julien Thierry 2017-11-03 11:44:16 +00:00 committed by Will Deacon
parent a92d4d1454
commit d125bffcef
1 changed files with 3 additions and 9 deletions
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12
arch/arm64/kernel/entry-ftrace.S
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@ -108,13 +108,8 @@ ENTRY(_mcount)
mcount_get_lr x1 // function's lr (= parent's pc)
blr x2 // (*ftrace_trace_function)(pc, lr);
#ifndef CONFIG_FUNCTION_GRAPH_TRACER
skip_ftrace_call: // return;
mcount_exit // }
#else
mcount_exit // return;
// }
skip_ftrace_call:
skip_ftrace_call: // }
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
ldr_l x2, ftrace_graph_return
cmp x0, x2 // if ((ftrace_graph_return
b.ne ftrace_graph_caller // != ftrace_stub)
@ -123,9 +118,8 @@ skip_ftrace_call:
adr_l x0, ftrace_graph_entry_stub // != ftrace_graph_entry_stub))
cmp x0, x2
b.ne ftrace_graph_caller // ftrace_graph_caller();
mcount_exit
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
mcount_exit
ENDPROC(_mcount)
#else /* CONFIG_DYNAMIC_FTRACE */