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[PATCH v2 09/17] arm64: disable function graph tracing with SCS

From: samitolvanen@google.com
Date: 2019-10-24 22:52:14
Also in: lkml
Subsystem: arm64 port (aarch64 architecture), the rest · Maintainers: Catalin Marinas, Will Deacon, Linus Torvalds

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 3f047afb982c..8cda176dad9a 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


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