Re: [PATCH] unified device list allocator

From: Christoph Hellwig
Date: Tue Mar 08 2005 - 00:59:33 EST

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.
- /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.
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