From: Andrew Morton <akpm@linux-foundation.org>
To: David Brownell <david-b@pacbell.net>
Cc: linux-kernel@vger.kernel.org, avorontsov@ru.mvista.com
Subject: Re: [patch 2.6.25-rc5 1/2] gpiolib: dynamic gpio number allocation
Date: Thu, 13 Mar 2008 16:28:03 -0700 [thread overview]
Message-ID: <20080313162803.ab8bfd4c.akpm@linux-foundation.org> (raw)
In-Reply-To: <200803131618.58516.david-b@pacbell.net>
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?
next prev parent reply other threads:[~2008-03-13 23:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-13 22:49 [patch 2.6.25-rc5 1/2] gpiolib: dynamic gpio number allocation David Brownell
2008-03-13 23:00 ` Andrew Morton
2008-03-13 23:18 ` David Brownell
2008-03-13 23:28 ` Andrew Morton [this message]
2008-03-13 23:54 ` Anton Vorontsov
2008-03-14 0:53 ` David Brownell
2008-03-14 2:17 ` Andrew Morton
2008-03-14 5:52 ` David Brownell
2008-03-14 1:54 ` David Brownell
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