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SubjectRe: [PATCH] irq: Add EXPORT_SYMBOL to function of irq generic-chip
2011/10/12 Thomas Gleixner <>:
> On Wed, 12 Oct 2011, Nobuhiro Iwamatsu wrote:
>> Although some functions of of irq generic-chip can be used,
>> since EXPORT_SYMBOL is not specified, it cannot use.
> This does not make sense. In which context they can't be used?

Yes, this is mistake. Correctly, it is undefined error.

ERROR: "irq_setup_generic_chip" [drivers/gpio/gpio-pch.ko] undefined!
ERROR: "irq_alloc_generic_chip" [drivers/gpio/gpio-pch.ko] undefined!
ERROR: "irq_setup_generic_chip" [drivers/gpio/gpio-ml-ioh.ko] undefined!
ERROR: "irq_alloc_generic_chip" [drivers/gpio/gpio-ml-ioh.ko] undefined!

>> This is revised that EXPORT_SYMBOL can be added and referred
>> to in functions.
> EXPORT_SYMBOL_GPL if at all please.


> And I'd rather avoid the exports, except those
>> +EXPORT_SYMBOL(irq_alloc_generic_chip);
>> +EXPORT_SYMBOL(irq_setup_generic_chip);
>> +EXPORT_SYMBOL(irq_setup_alt_chip);
>> +EXPORT_SYMBOL(irq_remove_generic_chip);
> which are really necessary. To gain access to the various helper
> functions we're better off to create a data structure with function
> pointers.
> struct irq_gc_functions {
>       void (* irq_gc_noop)(...);
>       ...
> };
> Instantiate this structure in kernel/irq/generic-chip.c, statically
> initialize it with pointers to those helper functions and export that
> data structure. That's way more efficient than having the overhead of
> the symbol export for each of the functions.

OK, I will send the patch to which this function was added.

Thanks for your comments.

Best regards,

Nobuhiro Iwamatsu
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