From ca5d376e17072c1b60c3fee66f3be58ef018952d Mon Sep 17 00:00:00 2001 From: Dou Liyang Date: Sat, 28 Oct 2017 14:06:44 +0800 Subject: 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 Reported-by: Juergen Gross Signed-off-by: Dou Liyang Reviewed-by: Juergen Gross Acked-by: Thomas Gleixner Cc: Linus Torvalds Cc: Peter Zijlstra Cc: boris.ostrovsky@oracle.com Cc: bp@suse.de Cc: luto@kernel.org Cc: vkuznets@redhat.com Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1509170804-3813-1-git-send-email-douly.fnst@cn.fujitsu.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/smpboot.c | 3 ++- arch/x86/xen/spinlock.c | 6 ++++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 361f91674ce5..198416ddff01 100644 --- 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 e8ab80ad7a6f..1e1462d3d43e 100644 --- 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"); -- cgit v1.2.3