[Xen-ia64-devel] Re: [PATCH] Re: [Xen-devel] Re: [PATCH 2/2] PV framebuffer

[Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>]

Hi, Markus

  About SMP DomU VFB call trace problem.

 I searched the code and found
the code in smp_call_function line337@linux/arch/ia64/kernel/smp.c
   WARN_ON(irqs_disabled());

The call trace problem caused by spin_lock_irqsave()
in xenfb_update_screen@linux/drivers/xen/fbfront/xenfb.c

Why you need to use spin_lock_irqsave in xenfb_update()?
I understand the locking but why irqsave is required at this point?

Thanks
Atsushi SAKAI


>Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx> writes:
>
>> Hi, Markus
>>
>>  I am checking VFB with SMP
>> with xen-ia64-unstable cset 12886.
>>
>> But It seems strange behavior.
>> (call trace appeared from DomU xm console output)
>> Did you test it on SMP DomU? 
>> Of course UP DomU seems fine at this moment.
>>
>> Thanks
>> Atsushi SAKAI
>
>Please provide details, including xm console output.
>







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