| 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 |
| |
