[patch 07/20] KVM/PPC/Book3S HV: Use cpuhp_setup_state_nocalls_locked()

[Thomas Gleixner]

From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>

kvmppc_alloc_host_rm_ops() holds get_online_cpus() while invoking
cpuhp_setup_state_nocalls().

cpuhp_setup_state_nocalls() invokes get_online_cpus() as well. This is
correct, but prevents the conversion of the hotplug locking to a percpu
rwsem.

Use cpuhp_setup_state_nocalls_locked() to avoid the nested call.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Alexander Graf <agraf@xxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: kvm-ppc@xxxxxxxxxxxxxxx
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx

---
 arch/powerpc/kvm/book3s_hv.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -3336,10 +3336,10 @@ void kvmppc_alloc_host_rm_ops(void)
 		return;
 	}
 
-	cpuhp_setup_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE,
-				  "ppc/kvm_book3s:prepare",
-				  kvmppc_set_host_core,
-				  kvmppc_clear_host_core);
+	cpuhp_setup_state_nocalls_locked(CPUHP_KVM_PPC_BOOK3S_PREPARE,
+					 "ppc/kvm_book3s:prepare",
+					 kvmppc_set_host_core,
+					 kvmppc_clear_host_core);
 	put_online_cpus();
 }