[PATCH v3 11/17] arm64: disable function graph tracing with SCS

samitolvanen
2019-10-31T17:01:15Z

With CONFIG_FUNCTION_GRAPH_TRACER, function return addresses are
modified in ftrace_graph_caller and prepare_ftrace_return to redirect
control flow to ftrace_return_to_handler. This is incompatible with
SCS.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
arch/arm64/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e7b57a8a5531..42867174920f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -148,7 +148,7 @@ config ARM64
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_ERROR_INJECTION
- select HAVE_FUNCTION_GRAPH_TRACER
+ select HAVE_FUNCTION_GRAPH_TRACER if !SHADOW_CALL_STACK
select HAVE_GCC_PLUGINS
select HAVE_HW_BREAKPOINT if PERF_EVENTS
select HAVE_IRQ_TIME_ACCOUNTING
--
2.24.0.rc0.303.g954a862665-goog