KVM: s390: introduce KMSG_COMPONENT for kvm-s390

Let's remove "kvm-s390" from our printk messages and make use
of pr_fmt instead.

Also replace one printk() occurrence by a equivalent pr_warn
on the way.

Suggested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

arch/s390/kvm/kvm-s390.c

@@ -36,6 +36,10 @@
 #include "kvm-s390.h"
 #include "gaccess.h"
 
+#define KMSG_COMPONENT "kvm-s390"
+#undef pr_fmt
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
 #define CREATE_TRACE_POINTS
 #include "trace.h"
 #include "trace-s390.h"
@@ -2086,7 +2090,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
 		kvm_s390_vcpu_start(vcpu);
 	} else if (is_vcpu_stopped(vcpu)) {
-		pr_err_ratelimited("kvm-s390: can't run stopped vcpu %d\n",
+		pr_err_ratelimited("can't run stopped vcpu %d\n",
 				   vcpu->vcpu_id);
 		return -EINVAL;
 	}
@@ -2617,7 +2621,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 	rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
 		mem->guest_phys_addr, mem->memory_size);
 	if (rc)
-		printk(KERN_WARNING "kvm-s390: failed to commit memory region\n");
+		pr_warn("failed to commit memory region\n");
 	return;
 }