path: root/arch/x86
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authorDuncan Sands <baldrick@free.fr>2011-08-30 10:58:22 +0200
committerAvi Kivity <avi@redhat.com>2011-08-30 14:42:30 +0300
commit3b217116edaac634bf31e85c35708298059a8171 (patch)
treed16ebe3a5ea3cc8b279e60f54e2df804cb754a1c /arch/x86
parentb4ca46e4e82a0a5976fe5eab85be585d75f8202f (diff)
KVM: Fix instruction size issue in pvclock scaling
Commit de2d1a524e94 ("KVM: Fix register corruption in pvclock_scale_delta") introduced a mul instruction that may have only a memory operand; the assembler therefore cannot select the correct size: pvclock.s:229: Error: no instruction mnemonic suffix given and no register operands; can't size instruction In this example the assembler is: #APP mul -48(%rbp) ; shrd $32, %rdx, %rax #NO_APP A simple solution is to use mulq. Signed-off-by: Duncan Sands <baldrick@free.fr> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h
index a518c0a45044..c59cc97fe6c1 100644
--- a/arch/x86/include/asm/pvclock.h
+++ b/arch/x86/include/asm/pvclock.h
@@ -44,7 +44,7 @@ static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift)
: "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) );
#elif defined(__x86_64__)
__asm__ (
- "mul %[mul_frac] ; shrd $32, %[hi], %[lo]"
+ "mulq %[mul_frac] ; shrd $32, %[hi], %[lo]"
: [lo]"=a"(product),
: "0"(delta),

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