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

[tip-bot for H. Peter Anvin]

Commit-ID:  c9e5a5a7034146493386d985ff432aed8059929a
Gitweb:     http://git.kernel.org/tip/c9e5a5a7034146493386d985ff432aed8059929a
Author:     H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
AuthorDate: Fri, 30 May 2014 08:19:21 -0700
Committer:  H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Fri, 30 May 2014 08:19:21 -0700

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@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1401387164-43416-7-git-send-email-fenghua.yu@xxxxxxxxx
---
 arch/x86/include/asm/xsave.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index 1ba577c..bbebd6e 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"
--
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