Subject: [PATCH v3 1/7] genirq: generic chip: export irq_map_generic_chip function

From: [email-masked] (Boris BREZILLON)
Date: Sun, 22 Jun 2014 09:59:44 +0200

On 22/06/2014 01:51, Jason Cooper wrote:
> On Fri, Jun 20, 2014 at 05:01:21PM +0200, Boris BREZILLON wrote:
>> Export the generic irq map function in order to provide irq_domain ops with
>> generic mapping and specific of xlate function (needed by the new atmel
>> AIC driver).
>>
>> Signed-off-by: Boris BREZILLON <[email-masked]>
>> ---
>>  include/linux/irq.h       | 2 ++
>>  kernel/irq/generic-chip.c | 5 +++--
>>  2 files changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/linux/irq.h b/include/linux/irq.h
>> index 0d998d8..62af592 100644
>> --- a/include/linux/irq.h
>> +++ b/include/linux/irq.h
>> @@ -771,6 +771,8 @@ void irq_gc_eoi(struct irq_data *d);
>>  int irq_gc_set_wake(struct irq_data *d, unsigned int on);
>>  
>>  /* Setup functions for irq_chip_generic */
>> +int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
>> +			 irq_hw_number_t hw_irq);
>>  struct irq_chip_generic *
>>  irq_alloc_generic_chip(const char *name, int nr_ct, unsigned int irq_base,
>>  		       void __iomem *reg_base, irq_flow_handler_t handler);
>> diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
>> index 452d6f2..cf80e7b 100644
>> --- a/kernel/irq/generic-chip.c
>> +++ b/kernel/irq/generic-chip.c
>> @@ -341,8 +341,8 @@ static struct lock_class_key irq_nested_lock_class;
>>  /*
>>   * irq_map_generic_chip - Map a generic chip for an irq domain
>>   */
>> -static int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
>> -				irq_hw_number_t hw_irq)
>> +int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
>> +			 irq_hw_number_t hw_irq)
>>  {
>>  	struct irq_data *data = irq_get_irq_data(virq);
>>  	struct irq_domain_chip_generic *dgc = d->gc;
>> @@ -394,6 +394,7 @@ static int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
>>  	irq_modify_status(virq, dgc->irq_flags_to_clear, dgc->irq_flags_to_set);
>>  	return 0;
>>  }
>> +EXPORT_SYMBOL_GPL(irq_map_generic_chip);
>>  
>>  struct irq_domain_ops irq_generic_chip_ops = {
>>  	.map	= irq_map_generic_chip,
> Why can't you use irq_generic_chip_ops.map in your code and avoid this
> patch entirely?

Because in this case I'll have to remove constness from my
irq_domain_ops struct and initialize it in my init function.
This is not a big concern, but in general I tend to declare ops struct
with a const constraint.

Tell me if you still want me to drop this patch and rework my init process.

Best Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com