From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Add ftrace_regs definition for x86_64 in the ftrace header to
clarify what register will be accessible from ftrace_regs.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
---
Changes in v2:
- Newly added.
---
arch/x86/include/asm/ftrace.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index 897cf02c20b1..fc60974a1d89 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -36,6 +36,12 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
struct ftrace_regs {
+ /*
+ * On the x86_64, the ftrace_regs saves;
+ * rax, rcx, rdx, rdi, rsi, r8, r9, rbp and rsp.
+ * Also orig_ax is used for passing direct trampoline address.
+ * x86_32 doesn't support ftrace_regs.
+ */
struct pt_regs regs;
};
