tracing/arm64: Have max stack tracer handle the case of return address after data

[linux-2.6-microblaze.git] / arch / arm64 / include / asm / ftrace.h

diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h
index 5ab5200..d48667b 100644 (file)
--- a/arch/arm64/include/asm/ftrace.h
+++ b/arch/arm64/include/asm/ftrace.h
@@ -14,6 +14,19 @@
 #define MCOUNT_ADDR            ((unsigned long)_mcount)
 #define MCOUNT_INSN_SIZE       AARCH64_INSN_SIZE
 
+/*
+ * Currently, gcc tends to save the link register after the local variables
+ * on the stack. This causes the max stack tracer to report the function
+ * frame sizes for the wrong functions. By defining
+ * ARCH_FTRACE_SHIFT_STACK_TRACER, it will tell the stack tracer to expect
+ * to find the return address on the stack after the local variables have
+ * been set up.
+ *
+ * Note, this may change in the future, and we will need to deal with that
+ * if it were to happen.
+ */
+#define ARCH_FTRACE_SHIFT_STACK_TRACER 1
+
 #ifndef __ASSEMBLY__
 #include <linux/compat.h>