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KVM: Fix build error due to 64-bit division in nsec_to_cycles()

PATCH Applied Avi Kivity 2 participants 2 messages Aug 26, 2010

Subsystems (3)
x86 KVM KVM x86
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Avi Kivity

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PATCH 1/1 KVM: Fix build error due to 64-bit division in nsec_to_cycles()

Use do_div() instead.

Signed-off-by Avi Kivity <[email protected]>
---
 arch/x86/kvm/x86.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
arch/x86/kvm/x86.c +6 -1
index 524bd3f..1de377f 100644
@@ -56,6 +56,7 @@
 #include <asm/i387.h>
 #include <asm/xcr.h>
 #include <asm/pvclock.h>
+#include <asm/div64.h>
 
 #define MAX_IO_MSRS 256
 #define CR0_RESERVED_BITS						\

@@ -907,11 +908,15 @@ static inline int kvm_tsc_changes_freq(void)
 
 static inline u64 nsec_to_cycles(u64 nsec)
 {
+	u64 ret;
+
 	WARN_ON(preemptible());
 	if (kvm_tsc_changes_freq())
 		printk_once(KERN_WARNING
 		 "kvm: unreliable cycle conversion on adjustable rate TSC\n");
-	return (nsec * __get_cpu_var(cpu_tsc_khz)) / USEC_PER_SEC;
+	ret = nsec * __get_cpu_var(cpu_tsc_khz);
+	do_div(ret, USEC_PER_SEC);
+	return ret;
 }
 
 void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
Signature · 1 line
1.7.1