xen/x86: Initialize per_cpu(xen_vcpu, 0) a little earlier

xen_cpuhp_setup() calls mutex_lock() which, when CONFIG_DEBUG_MUTEXES
is defined, ends up calling xen_save_fl(). That routine expects
per_cpu(xen_vcpu, 0) to be already initialized.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 366b6aed4a8e..96c2dea798a1 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1644,7 +1644,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
         xen_initial_gdt = &per_cpu(gdt_page, 0);
 
         xen_smp_init();
-        WARN_ON(xen_cpuhp_setup());
 
 #ifdef CONFIG_ACPI_NUMA
         /*
@@ -1658,6 +1657,8 @@ asmlinkage __visible void __init xen_start_kernel(void)
            possible map and a non-dummy shared_info. */
         per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
 
+        WARN_ON(xen_cpuhp_setup());
+
         local_irq_disable();
         early_boot_irqs_disabled = true;