x86/paravirt: Set up the virt_spin_lock_key after static keys get initialized

Commit:

  9043442b43b1 ("locking/paravirt: Use new static key for controlling call of virt_spin_lock()")

sets the static virt_spin_lock_key to a value before jump_label_init()
has been called, which will result in a WARN().

Reorder the initialization sequence:

 - Move the native_pv_lock_init() into native_smp_prepare_cpus()
 - set the value in xen_init_lock_cpu()

to avoid calling into the not yet initialized static keys subsystem.

Suggested-by: Juergen Gross <[email protected]>
Reported-by: Juergen Gross <[email protected]>
Signed-off-by: Dou Liyang <[email protected]>
Reviewed-by: Juergen Gross <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 361f91674ce507e6dacc68e87673138f7b1fd80a..198416ddff01bfdc106859d1a3d8ff672570b4e0 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1358,6 +1358,8 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
        pr_info("CPU0: ");
        print_cpu_info(&cpu_data(0));
 
+       native_pv_lock_init();
+
        uv_system_init();
 
        set_mtrr_aps_delayed_init();
@@ -1385,7 +1387,6 @@ void __init native_smp_prepare_boot_cpu(void)
        /* already set me in cpu_online_mask in boot_cpu_init() */
        cpumask_set_cpu(me, cpu_callout_mask);
        cpu_set_state_online(me);
-       native_pv_lock_init();
 }
 
 void __init native_smp_cpus_done(unsigned int max_cpus)

diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index e8ab80ad7a6ffa7d94f98f909d4a3df282218e1e..1e1462d3d43e3f2c03c636f342c42049464bda25 100644 (file)
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -81,8 +81,11 @@ void xen_init_lock_cpu(int cpu)
        int irq;
        char *name;
 
-       if (!xen_pvspin)
+       if (!xen_pvspin) {
+               if (cpu == 0)
+                       static_branch_disable(&virt_spin_lock_key);
                return;
+       }
 
        WARN(per_cpu(lock_kicker_irq, cpu) >= 0, "spinlock on CPU%d exists on IRQ%d!\n",
             cpu, per_cpu(lock_kicker_irq, cpu));
@@ -130,7 +133,6 @@ void __init xen_init_spinlocks(void)
 
        if (!xen_pvspin) {
                printk(KERN_DEBUG "xen: PV spinlocks disabled\n");
-               static_branch_disable(&virt_spin_lock_key);
                return;
        }
        printk(KERN_DEBUG "xen: PV spinlocks enabled\n");