Re: [PATCH v2 1/4] genirq: Introduce driver-readable IRQ status word

[Jan Kiszka <jan.kiszka@web.de>]

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Am 12.12.2010 18:29, Thomas Gleixner wrote:
> On Sun, 12 Dec 2010, Jan Kiszka wrote:
> 
>> From: Jan Kiszka <jan.kiszka@siemens.com>
>>
>> This associates a status word with every IRQ descriptor. Drivers can obtain
>> its content via get_irq_status(irq). First use case will be propagating the
>> interrupt sharing state.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>> ---
>>  include/linux/interrupt.h |    2 ++
>>  include/linux/irq.h       |    2 ++
>>  kernel/irq/manage.c       |   15 +++++++++++++++
>>  3 files changed, 19 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
>> index 79d0c4f..16cdbbf 100644
>> --- a/include/linux/interrupt.h
>> +++ b/include/linux/interrupt.h
>> @@ -126,6 +126,8 @@ struct irqaction {
>>  
>>  extern irqreturn_t no_action(int cpl, void *dev_id);
>>  
>> +extern unsigned long get_irq_status(unsigned long irq);
>> +
>>  #ifdef CONFIG_GENERIC_HARDIRQS
>>  extern int __must_check
>>  request_threaded_irq(unsigned int irq, irq_handler_t handler,
>> diff --git a/include/linux/irq.h b/include/linux/irq.h
>> index abde252..5554203 100644
>> --- a/include/linux/irq.h
>> +++ b/include/linux/irq.h
>> @@ -96,6 +96,7 @@ struct msi_desc;
>>   *			methods, to allow shared chip implementations
>>   * @msi_desc:		MSI descriptor
>>   * @affinity:		IRQ affinity on SMP
>> + * @status:		driver-readable status flags (IRQS_*)
>>   *
>>   * The fields here need to overlay the ones in irq_desc until we
>>   * cleaned up the direct references and switched everything over to
>> @@ -108,6 +109,7 @@ struct irq_data {
>>  	void			*handler_data;
>>  	void			*chip_data;
>>  	struct msi_desc		*msi_desc;
>> +	unsigned long		status;
> 
> That breaks the current code which has irq_data embedded and shadowed
> in irq_desc for migratory reasons until all users are fixed up and the
> GENERIC_HARDIRQS_NO_DEPRECATED sections are cleaned up. I know it's
> ugly, but that was the only way not to rewrite the world in one go. :)
> Just move it below affinity.
> 
> Also we should name it different than status, drv_status perhaps, to
> avoid confusion with the irq_desc status.

OK, will address both in a succeeding round (just waiting for potential
further comments).

Thanks,
Jan


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