* [PATCH] xen: sched: fix spinlock issue in schedule_cpu_switch().
@ 2016-04-11 16:27 Dario Faggioli
2016-04-11 16:38 ` George Dunlap
0 siblings, 1 reply; 4+ messages in thread
From: Dario Faggioli @ 2016-04-11 16:27 UTC (permalink / raw)
To: xen-devel; +Cc: Andrew Cooper, George Dunlap, Aaron Cornelius
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>
---
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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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] xen: sched: fix spinlock issue in schedule_cpu_switch().
2016-04-11 16:27 [PATCH] xen: sched: fix spinlock issue in schedule_cpu_switch() Dario Faggioli
@ 2016-04-11 16:38 ` George Dunlap
2016-04-11 16:59 ` Dario Faggioli
0 siblings, 1 reply; 4+ messages in thread
From: George Dunlap @ 2016-04-11 16:38 UTC (permalink / raw)
To: Dario Faggioli, xen-devel; +Cc: Andrew Cooper, Aaron Cornelius
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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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] xen: sched: fix spinlock issue in schedule_cpu_switch().
2016-04-11 16:38 ` George Dunlap
@ 2016-04-11 16:59 ` Dario Faggioli
2016-04-11 17:09 ` Konrad Rzeszutek Wilk
0 siblings, 1 reply; 4+ messages in thread
From: Dario Faggioli @ 2016-04-11 16:59 UTC (permalink / raw)
To: George Dunlap, xen-devel; +Cc: Andrew Cooper, Aaron Cornelius
[-- Attachment #1.1: Type: text/plain, Size: 1048 bytes --]
On Mon, 2016-04-11 at 17:38 +0100, George Dunlap wrote:
> 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>
>
Thanks George.
Sorry again for the issue, and sorry if it did take longer.
I said "Monday morning", but this morning my test box was otherwise
busy, and this time, I really wanted to make sure I tested this on a
debug build! :-P
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
[-- Attachment #1.2: This is a digitally signed message part --]
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] xen: sched: fix spinlock issue in schedule_cpu_switch().
2016-04-11 16:59 ` Dario Faggioli
@ 2016-04-11 17:09 ` Konrad Rzeszutek Wilk
0 siblings, 0 replies; 4+ messages in thread
From: Konrad Rzeszutek Wilk @ 2016-04-11 17:09 UTC (permalink / raw)
To: Dario Faggioli; +Cc: xen-devel, Aaron Cornelius, George Dunlap, Andrew Cooper
On Mon, Apr 11, 2016 at 06:59:23PM +0200, Dario Faggioli wrote:
> On Mon, 2016-04-11 at 17:38 +0100, George Dunlap wrote:
> > 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>
> >
> Thanks George.
And applied.
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2016-04-11 16:27 [PATCH] xen: sched: fix spinlock issue in schedule_cpu_switch() Dario Faggioli
2016-04-11 16:38 ` George Dunlap
2016-04-11 16:59 ` Dario Faggioli
2016-04-11 17:09 ` Konrad Rzeszutek Wilk
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