linux-kernel - Re: [PATCH 3/3] misc: use a proper range for minor number dynamic allocation

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Message-Id: <20091111153632.944a255c.akpm@linux-foundation.org>
Date:	Wed, 11 Nov 2009 15:36:32 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>,
	linux-kernel@...r.kernel.org, rubini@...dd.com, gregkh@...e.de
Subject: Re: [PATCH 3/3] misc: use a proper range for minor number dynamic
 allocation

On Mon, 09 Nov 2009 16:34:07 -0800
"H. Peter Anvin" <hpa@...or.com> wrote:

> On 11/09/2009 04:30 PM, Thadeu Lima de Souza Cascardo wrote:
> > The current dynamic allocation of minor number for misc devices has some
> > drawbacks.
> > 
> > First of all, the range for dynamic numbers include some statically
> > allocated numbers. It goes from 63 to 0, and we have numbers in the
> > range from 1 to 15 already allocated. Although, it gives priority to the
> > higher and not allocated numbers, we may end up in a situation where we
> > must reject registering a driver which got a static number because a
> > driver got its number with dynamic allocation. Considering fs/dlm/user.c
> > allocates as many misc devices as lockspaces are created, and that we
> > have more than 50 users around, it's not unreasonable to reach that
> > situation.
> > 
> > The proposed solution uses the not yet reserved range from 64 to 127. If
> > more devices are needed, we may push 64 to 16.
> > 
> 
> Again, why not push these up above 256?
> 

I merged this patch, but made a note-to-self that there are remaining
open issues..
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