Re: [PATCH] xen: sched: fix spinlock issue in schedule_cpu_switch().

[George Dunlap <george.dunlap@citrix.com>]

On 11/04/16 17:27, Dario Faggioli wrote:
> Commit 94734ab7c3f5 ("xen: sched: close potential races
> when switching scheduler to CPUs") buggily replaced a call
> to pcpu_schedule_lock_irq() with just pcpu_schedule_lock(),
> causing the relevant irq_safe vs. non-irq_safe ASSERT()
> in check_lock() to trigger.
> 
> Fix that.
> 
> Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>

Acked-by: George Dunlap <george.dunlap@citrix.com>

> ---
> Cc: George Dunlap <george.dunlap@citrix.com>
> Cc: Andrew Cooper <andrew.cooper3@citrix.com>
> Cc: Aaron Cornelius <aaron.cornelius@dornerworks.com>
> ---
>  xen/common/schedule.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/xen/common/schedule.c b/xen/common/schedule.c
> index 922b035..013e5f1 100644
> --- a/xen/common/schedule.c
> +++ b/xen/common/schedule.c
> @@ -1702,7 +1702,7 @@ int schedule_cpu_switch(unsigned int cpu, struct cpupool *c)
>       * that the lock itself changed, and retry acquiring the new one (which
>       * will be the correct, remapped one, at that point).
>       */
> -    old_lock = pcpu_schedule_lock(cpu);
> +    old_lock = pcpu_schedule_lock_irq(cpu);
>  
>      vpriv_old = idle->sched_priv;
>      ppriv_old = per_cpu(schedule_data, cpu).sched_priv;
> 


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