x86/xsave: Make it clear that the XSAVE macros use (%edi)/(%rdi)

The XSAVE instruction family takes a memory argment.  The macros use
(%edi)/(%rdi) as that memory argument - make that clear to the reader.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1401387164-43416-7-git-send-email-fenghua.yu@intel.com

diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index 1ba577c670ad110a2ced566757e23b35096f3258..bbebd6e0a9ce67837b17477f5bc5d1831a3d60a1 100644 (file)
--- 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"