riscv/ftrace: Add basic support
This patch contains basic ftrace support for RV64I platform.
Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph
tracer (HAVE_FUNCTION_GRAPH_TRACER), and a frame pointer test
(HAVE_FUNCTION_GRAPH_FP_TEST) are implemented following the
instructions in Documentation/trace/ftrace-design.txt.
Note that the functions in both ftrace.c and setup.c should not be
hooked with the compiler's -pg option: to prevent infinite self-
referencing for the former, and to ignore early setup stuff for the
latter.
Signed-off-by: Alan Kao <alankao@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index ab8baf7..196f62f 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -2,6 +2,11 @@
# Makefile for the RISC-V Linux kernel
#
+ifdef CONFIG_FTRACE
+CFLAGS_REMOVE_ftrace.o = -pg
+CFLAGS_REMOVE_setup.o = -pg
+endif
+
extra-y += head.o
extra-y += vmlinux.lds
@@ -29,5 +34,7 @@
obj-$(CONFIG_SMP) += smpboot.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_MODULES) += module.o
+obj-$(CONFIG_FUNCTION_TRACER) += mcount.o
+obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
clean: