Date: Fri, 19 Dec 1997 09:00:02 +1030 From: Mike Smith <mike@smith.net.au> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: Darren Reed <avalon@coombs.anu.edu.au>, freebsd-hackers@FreeBSD.ORG Subject: Re: converting drivers to dynamic memory... Message-ID: <199712182230.JAA01661@word.smith.net.au> In-Reply-To: Your message of "Thu, 18 Dec 1997 06:51:07 -0800." <19971218065107.10999@hydrogen.nike.efn.org>
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>
> yep, I think that would be a great addition... IMO, once devfs has
> finally been completed, we will still need a minor number of the void *
> (I happen to like the name dev_info_t), the minor so that we know what
> part of the device driver we are accessing... else we would need to
> allocate a bunch of small structs like:
> struct {
> int option;
> struct devicedata data;
> }
>
> which would be really wasteful of precious memory resources...
No. I take your point about wanting to have multiple DEVFS entries
referencing a single softc structure though; you might want to have
something like:
struct devfs_softc_reference
{
void *softc;
int token;
}
inside the devfs_node structure.
Forget the btree model; it's not going to fly in the face of a direct
reference approach.
mike
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