Subject: [PATCH v6 1/8] KVM: arm/arm64: Remove redundant preemptible checks

From: [email-masked] (Christoffer Dall)
Date: Mon, 4 Dec 2017 21:04:59 +0100

From: Christoffer Dall <[email-masked]>

The __this_cpu_read() and __this_cpu_write() functions already implement
checks for the required preemption levels when using
CONFIG_DEBUG_PREEMPT which gives you nice error messages and such.
Therefore there is no need to explicitly check this using a BUG_ON() in
the code (which we don't do for other uses of per cpu variables either).

Acked-by: Marc Zyngier <[email-masked]>
Reviewed-by: Andre Przywara <[email-masked]>
Signed-off-by: Christoffer Dall <[email-masked]>
---
 virt/kvm/arm/arm.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index a6524ff27de4..859ff7e3a1eb 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -71,7 +71,6 @@ static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
 
 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
 {
-	BUG_ON(preemptible());
 	__this_cpu_write(kvm_arm_running_vcpu, vcpu);
 }
 
@@ -81,7 +80,6 @@ static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
  */
 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
 {
-	BUG_ON(preemptible());
 	return __this_cpu_read(kvm_arm_running_vcpu);
 }
 
-- 
2.14.2