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Subject[PATCH 6/6] Revert "x86/paravirt: Set up the virt_spin_lock_key after static keys get initialized"
Date
This reverts commit ca5d376e17072c1b60c3fee66f3be58ef018952d.

Commit 8990cac6e5ea ("x86/jump_label: Initialize static branching
early") adds jump_label_init() call in setup_arch() to make static
keys initialized early, so we could use the original simpler code
again.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: Dou Liyang <douly.fnst@cn.fujitsu.com>
---
arch/x86/kernel/smpboot.c | 3 +--
arch/x86/xen/spinlock.c | 6 ++----
2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 362dd89..44472ca 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1308,8 +1308,6 @@ 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();
@@ -1339,6 +1337,7 @@ 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 calculate_max_logical_packages(void)
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index 3776122..6deb490 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -68,11 +68,8 @@ void xen_init_lock_cpu(int cpu)
int irq;
char *name;

- if (!xen_pvspin) {
- if (cpu == 0)
- static_branch_disable(&virt_spin_lock_key);
+ if (!xen_pvspin)
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));
@@ -124,6 +121,7 @@ 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");
--
1.8.3.1
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