[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH 5/5] x86/xen: Don't register PV spinlock IPI when it isn't going to be used
On 1/4/21 12:32 PM, David Woodhouse wrote: > On Mon, 2021-01-04 at 12:06 -0500, boris.ostrovsky@xxxxxxxxxx wrote: >>> @@ -115,7 +115,7 @@ PV_CALLEE_SAVE_REGS_THUNK(xen_vcpu_stolen); >>> void __init xen_init_spinlocks(void) >>> { >>> /* Don't need to use pvqspinlock code if there is only 1 vCPU. */ >>> - if (num_possible_cpus() == 1 || nopvspin) >>> + if (num_possible_cpus() == 1 || nopvspin || !xen_have_vector_callback) >> >> xen_init_spinlock() will not be called without vector callbacks so >> this test is not really necessary. > Right, that's just paranoia to make the conditions consistent and safe. OK, but we still need to do something about virt_spin_lock_key. -boris
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