1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index 1ba577c670ad..bbebd6e0a9ce 100644
--- a/arch/x86/include/asm/xsave.h
+++ b/arch/x86/include/asm/xsave.h
@@ -52,6 +52,7 @@ extern void xsave_init(void);
 extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
 extern int init_fpu(struct task_struct *child);
 
+/* These macros all use (%edi)/(%rdi) as the single memory argument. */
 #define XSAVE           ".byte " REX_PREFIX "0x0f,0xae,0x27"
 #define XSAVEOPT        ".byte " REX_PREFIX "0x0f,0xae,0x37"
 #define XSAVES          ".byte " REX_PREFIX "0x0f,0xc7,0x2f"