Re: [Xen-devel] [PATCH 5/7] xen/arm: Fix assert in send_SGI_one

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 09/09/2013 02:30 PM, Ian Campbell wrote:
> On Fri, 2013-08-30 at 14:30 +0100, Julien Grall wrote:
>> The GIC can handle maximum 8 cpus (0...7). The CPU id 7 is still valid.
>>
>> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
>> ---
>>  xen/arch/arm/gic.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
>> index 4f3a8a5..6dcefd7 100644
>> --- a/xen/arch/arm/gic.c
>> +++ b/xen/arch/arm/gic.c
>> @@ -481,7 +481,7 @@ void send_SGI_mask(const cpumask_t *cpumask, enum 
>> gic_sgi sgi)
>>  
>>  void send_SGI_one(unsigned int cpu, enum gic_sgi sgi)
>>  {
>> -    ASSERT(cpu < 7);  /* Targets bitmap only supports 8 CPUs */
>> +    ASSERT(cpu < NR_GIC_CPU_IF);  /* Targets bitmap only supports 8 CPUs */
> 
> cpu here is a logical cpu id, not a gic id, I think?

Right.

> In which case although 8 happens to be correct: NR_GIC_CPU_IF is the
> wrong thing to be using and in any case this seems against the general
> principals of this series.

NR_GIC_CPU_IF indicates the number of cpu interface handled by the GIC.
Xen won't be able to register more than 8 CPUs, ie logical cpu id 0..7.

>>      send_SGI_mask(cpumask_of(cpu), sgi);
>>  }
>>  
> 
> 

-- 
Julien Grall

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