Re: [PATCH] unified device list allocator

From: Matt Mackall
Date: Tue Mar 08 2005 - 01:18:49 EST

On Tue, Mar 08, 2005 at 05:56:27AM +0000, Christoph Hellwig wrote:
> On Mon, Mar 07, 2005 at 09:50:35PM -0800, Andrew Morton wrote:
> > > register_blkdev only happens at module_init time (and in fact should go
> > > away completely, so I'm not happy wit hthe surgey to keep it barely alive
> > > at all)
> >
> > Is anyone working on that?
> I had a patch from a long time ago that just killed it, but that one isn't
> useable for current users anymore.
> There's two things it's doing currently:
> - when called with the major argument as 0 it returns an unused major number
> from the top of the old 255 entries major list. This should be replaced
> by a real dynamic dev_t allocator, similar to alloc_chrdev_region.

Umm, this replaces alloc_chrdev_region too. If instead you mean "let's
migrate all the users to a sensible interface", I agree. And that
means killing alloc_chrdev_region too. (baseminor makes no sense for
dynamic allocation - you either know your prefered major and minor or
you know neither.)

> - /proc/devices. This interface has traditionally been used by things
> like installer but these day's it's totally bogus as the one major, one
> driver limitation got lifeted. We'll probably have to deprecate it and
> kill it in half a year or a similar timespan.

I think killing /proc/devices has to wait until after devfs removal,
when everyone is more or less comfortable with its alternatives.

Mathematics is the supreme nostalgia of our time.
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