On Sat, Feb 9, 2013 at 6:58 PM, Grant Likely <grant.likely@xxxxxxxxxxxx> wrote: > I'm actually going to NAK this one. This is a hot path. Having a O(1) > lookup from gpio number to gpio desc is important. I know you want to be > rid of the gpio_desc table entirely, but in this case I think it is > warranted. However, you can change the gpio_desc table to be a table of > pointers to gpio_descs instead of a table of gpio_descs. That would save > a lot of memory since unused GPIOs wouldn't have gpio_descs associated > with them. It is also the mechanism used by the IRQ subsystem. That would work - what I don't like is that it still ends being a fixed-size static array that is not necessarily tailored to the platform's needs. But I understand you don't want to punish the users of the integer-based API, even though the penalty should really be neglectable here. Well, maybe I can try to come again with this once everybody uses GPIO descriptors instead of integers. ;) Alex. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
