Messages in this thread | | | Date | Thu, 13 Mar 2008 16:28:03 -0700 | From | Andrew Morton <> | Subject | Re: [patch 2.6.25-rc5 1/2] gpiolib: dynamic gpio number allocation |
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On Thu, 13 Mar 2008 15:18:58 -0800 David Brownell <david-b@pacbell.net> wrote:
> On Thursday 13 March 2008, Andrew Morton wrote: > > > hm. I suppose that if someone want a huge number of GPIOs then we can > > convert this to a bitmap or an IDR tree easily enough. > > Actually, I tried IDRs for a while and they broke platforms > which needed to initialize and use GPIOs early: before kmalloc > would work. A real PITA that was -- and slow too.
If IDRs were slow, that linear search will be glacial.
> > > Shouldn't ARCH_NR_GPIOS be CONFIG_NR_GPIOS? > > No more than NR_IRQS is settable via Kconfig. And for > rather similar reasons. :)
What are those reasons?
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