From 022ae220d6e7b5bd064bc8698c271dca4dac7d8c Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Mon, 8 May 2017 22:27:25 +0200
Subject: [PATCH] x86/hyperv_clock: be explicit about mul instruction data size

With gcc 4.7.2, the build fails with:

x86/hyperv_clock.c: Assembler messages:
x86/hyperv_clock.c:21: Error: no instruction mnemonic suffix given and no register operands; can't size instruction

In order to avoid this, make the mul instruction data size explicit by
adding the appropriate suffix. It operates on 64-bit data, so use
"mulq".

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 x86/hyperv_clock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/x86/hyperv_clock.c b/x86/hyperv_clock.c
index 8b1deba..6c4dd56 100644
--- a/x86/hyperv_clock.c
+++ b/x86/hyperv_clock.c
@@ -19,7 +19,7 @@ static inline u64 scale_delta(u64 delta, u64 mul_frac)
 	u64 product, unused;
 
 	__asm__ (
-		"mul %3"
+		"mulq %3"
 		: "=d" (product), "=a" (unused) : "1" (delta), "rm" ((u64)mul_frac) );
 
 	return product;
-- 
2.7.4