cvs commit: src/sys/conf majors

[Ruslan Ermilov]

On Mon, Feb 02, 2004 at 02:25:16PM -0800, Paul Saab wrote:
> Ruslan Ermilov (ru at FreeBSD.org) wrote:
> > What PHK means is that if this driver is both for 5.x and 4.x,
> > then you should only register its major in RELENG_4 -- 5.x
> > provides automatic major numbers allocations:
> 
> And it will run in RELENG_4 as well as -current, so it needs a major
> number.
> 
In -current the major numbers are allocated dynamically when you
register a device with DEVFS -- this way you can have more than
255 drivers in the system, and use 255 of them simultaneously.
By (unnecessarily) reserving the major in -current you reduce the
pool for dynamic major allocations by one.


Cheers,
-- 
Ruslan Ermilov
FreeBSD committer
ru at FreeBSD.org
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