Messages in this thread Patch in this message |  | | Date | Sat, 15 Apr 2017 19:01:14 +0200 | From | Thomas Gleixner <> | Subject | [patch 07/20] KVM/PPC/Book3S HV: Use cpuhp_setup_state_nocalls_locked() |
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Graf <agraf@suse.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: kvm@vger.kernel.org Cc: kvm-ppc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org
--- 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(); }
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