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

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Message-ID: <4AF8B4FF.9050405@zytor.com>
Date:	Mon, 09 Nov 2009 16:34:07 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
CC:	linux-kernel@...r.kernel.org, device@...ana.org,
	akpm@...ux-foundation.org, rubini@...dd.com, gregkh@...e.de
Subject: Re: [PATCH 3/3] misc: use a proper range for minor number dynamic
 allocation

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?

	-hpa
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