linux-kernel - [PATCH 16/16] KVM: arm/arm64: vgic: Replace spin_is

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Date:   Tue,  2 Oct 2018 22:39:02 -0700
From:   Lance Roy <ldr709@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Lance Roy <ldr709@...il.com>,
        Christoffer Dall <christoffer.dall@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Eric Auger <eric.auger@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu
Subject: [PATCH 16/16] KVM: arm/arm64: vgic: Replace spin_is_locked() with lockdep

lockdep_assert_held() is better suited to checking locking requirements,
since it won't get confused when someone else holds the lock. This is
also a step towards possibly removing spin_is_locked().

Signed-off-by: Lance Roy <ldr709@...il.com>
Cc: Christoffer Dall <christoffer.dall@....com>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Eric Auger <eric.auger@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: <kvmarm@...ts.cs.columbia.edu>
---
 virt/kvm/arm/vgic/vgic.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 7cfdfbc910e0..50e25438fb3c 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -196,7 +196,7 @@ void vgic_irq_set_phys_active(struct vgic_irq *irq, bool active)
  */
 static struct kvm_vcpu *vgic_target_oracle(struct vgic_irq *irq)
 {
-	DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&irq->irq_lock));
+	lockdep_assert_held(&irq->irq_lock);
 
 	/* If the interrupt is active, it must stay on the current vcpu */
 	if (irq->active)
@@ -273,7 +273,7 @@ static void vgic_sort_ap_list(struct kvm_vcpu *vcpu)
 {
 	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
 
-	DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu->ap_list_lock));
+	lockdep_assert_held(&vgic_cpu->ap_list_lock);
 
 	list_sort(NULL, &vgic_cpu->ap_list_head, vgic_irq_cmp);
 }
@@ -311,7 +311,7 @@ bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
 {
 	struct kvm_vcpu *vcpu;
 
-	DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&irq->irq_lock));
+	lockdep_assert_held(&irq->irq_lock);
 
 retry:
 	vcpu = vgic_target_oracle(irq);
@@ -702,7 +702,7 @@ static inline void vgic_fold_lr_state(struct kvm_vcpu *vcpu)
 static inline void vgic_populate_lr(struct kvm_vcpu *vcpu,
 				    struct vgic_irq *irq, int lr)
 {
-	DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&irq->irq_lock));
+	lockdep_assert_held(&irq->irq_lock);
 
 	if (kvm_vgic_global_state.type == VGIC_V2)
 		vgic_v2_populate_lr(vcpu, irq, lr);
@@ -736,7 +736,7 @@ static int compute_ap_list_depth(struct kvm_vcpu *vcpu,
 
 	*multi_sgi = false;
 
-	DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu->ap_list_lock));
+	lockdep_assert_held(&vgic_cpu->ap_list_lock);
 
 	list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
 		int w;
@@ -761,7 +761,7 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
 	bool multi_sgi;
 	u8 prio = 0xff;
 
-	DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu->ap_list_lock));
+	lockdep_assert_held(&vgic_cpu->ap_list_lock);
 
 	count = compute_ap_list_depth(vcpu, &multi_sgi);
 	if (count > kvm_vgic_global_state.nr_lr || multi_sgi)
-- 
2.19.0