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xen: branch for v5.10-rc5 

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Merge tag 'for-linus-5.10b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen fix from Juergen Gross:
 "A single fix for avoiding WARN splats when booting a Xen guest with
  nosmt"

* tag 'for-linus-5.10b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  x86/xen: don't unbind uninitialized lock_kicker_irq
This commit is contained in:
Linus Torvalds 2020-11-20 10:30:48 -08:00
parent bd4d74e8f8 65cae18882
commit 4ccf7a01e8
1 changed files with 11 additions and 1 deletions
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12
arch/x86/xen/spinlock.c
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@ -93,10 +93,20 @@ void xen_init_lock_cpu(int cpu)
void xen_uninit_lock_cpu(int cpu)
{
int irq;
if (!xen_pvspin)
return;
unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL);
/*
* When booting the kernel with 'mitigations=auto,nosmt', the secondary
* CPUs are not activated, and lock_kicker_irq is not initialized.
*/
irq = per_cpu(lock_kicker_irq, cpu);
if (irq == -1)
return;
unbind_from_irqhandler(irq, NULL);
per_cpu(lock_kicker_irq, cpu) = -1;
kfree(per_cpu(irq_name, cpu));
per_cpu(irq_name, cpu) = NULL;