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KVM: arm/arm64: prefer IS_ENABLED to a static variable

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IS_ENABLED gives compile-time checking and keeps the code clearer.

The one exception is inside kvm_vm_ioctl_check_extension, where
the established idiom is to wrap the case labels with an #ifdef.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-03-05 12:26:06 +01:00 committed by Christoffer Dall
parent 0f37247574
commit 69ff5c619c
1 changed files with 5 additions and 12 deletions
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17
arch/arm/kvm/arm.c
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@ -61,8 +61,6 @@ static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
static u8 kvm_next_vmid;
static DEFINE_SPINLOCK(kvm_vmid_lock);
static bool vgic_present;
static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
{
BUG_ON(preemptible());
@ -172,9 +170,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
int r;
switch (ext) {
#ifdef CONFIG_KVM_ARM_VGIC
case KVM_CAP_IRQCHIP:
r = vgic_present;
break;
#endif
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_USER_MEMORY:
case KVM_CAP_SYNC_MMU:
@ -831,7 +829,7 @@ static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
switch (dev_id) {
case KVM_ARM_DEVICE_VGIC_V2:
if (!vgic_present)
if (!IS_ENABLED(CONFIG_KVM_ARM_VGIC))
return -ENXIO;
return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
default:
@ -847,10 +845,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
switch (ioctl) {
case KVM_CREATE_IRQCHIP: {
if (vgic_present)
return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
else
if (!IS_ENABLED(CONFIG_KVM_ARM_VGIC))
return -ENXIO;
return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
}
case KVM_ARM_SET_DEVICE_ADDR: {
struct kvm_arm_device_addr dev_addr;
@ -1035,10 +1032,6 @@ static int init_hyp_mode(void)
if (err)
goto out_free_context;
#ifdef CONFIG_KVM_ARM_VGIC
vgic_present = true;
#endif
/*
* Init HYP architected timer support
*/