36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
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From 022ae220d6e7b5bd064bc8698c271dca4dac7d8c Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Mon, 8 May 2017 22:27:25 +0200
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Subject: [PATCH] x86/hyperv_clock: be explicit about mul instruction data size
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With gcc 4.7.2, the build fails with:
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x86/hyperv_clock.c: Assembler messages:
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x86/hyperv_clock.c:21: Error: no instruction mnemonic suffix given and no register operands; can't size instruction
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In order to avoid this, make the mul instruction data size explicit by
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adding the appropriate suffix. It operates on 64-bit data, so use
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"mulq".
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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---
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x86/hyperv_clock.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/x86/hyperv_clock.c b/x86/hyperv_clock.c
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index 8b1deba..6c4dd56 100644
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--- a/x86/hyperv_clock.c
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+++ b/x86/hyperv_clock.c
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@@ -19,7 +19,7 @@ static inline u64 scale_delta(u64 delta, u64 mul_frac)
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u64 product, unused;
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__asm__ (
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- "mul %3"
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+ "mulq %3"
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: "=d" (product), "=a" (unused) : "1" (delta), "rm" ((u64)mul_frac) );
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return product;
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--
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2.7.4
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