[PATCH v2 3/6] riscv: Add ftrace_stub_graph

Sami Tolvanen
2023-07-10T18:35:54Z

Commit 883bbbffa5a4 ("ftrace,kcfi: Separate ftrace_stub() and
ftrace_stub_graph()") added a separate ftrace_stub_graph function for
CFI_CLANG. Add the stub to fix FUNCTION_GRAPH_TRACER compatibility
with CFI.

Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
arch/riscv/kernel/mcount.S | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/riscv/kernel/mcount.S b/arch/riscv/kernel/mcount.S
index 6c9469050f4c..8818a8fa9ff3 100644
--- a/arch/riscv/kernel/mcount.S
+++ b/arch/riscv/kernel/mcount.S
@@ -57,6 +57,10 @@ SYM_TYPED_FUNC_START(ftrace_stub)
SYM_FUNC_END(ftrace_stub)

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+SYM_TYPED_FUNC_START(ftrace_stub_graph)
+ ret
+SYM_FUNC_END(ftrace_stub_graph)
+
ENTRY(return_to_handler)
/*
* On implementing the frame point test, the ideal way is to compare the
--
2.41.0.255.g8b1d071c50-goog