netdev - Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

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Date:	Tue, 03 Jul 2007 00:12:50 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	hadi@...erus.ca, Zhang Rui <rui.zhang@...el.com>,
	netdev@...r.kernel.org,
	"linux-acpi@...r" <linux-acpi@...r.kernel.org>, lenb@...nel.org,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

On Mon, 2007-07-02 at 16:48 +0200, Johannes Berg wrote:

> If I find time I might
> actually fix the unregistration bug too, but I have a feeling digging in
> the socket code might take more time than I have right now.

Hmm. I started digging into the af_netlink.c code and realised that the
whole thing I've been doing cannot possibly work completely since the
genl socket is created with GENL_MAX_ID as the "groups" parameter to
netlink_kernel_create() and that limits the groups, and the af_netlink
code really wants to know the number of groups up-front.

So some deeper surgery is required to lift the limit of 1023 multicast
group now. Not that I like the current genetlink code, we allocate 256
bytes for the in-kernel socket just for the listeners bitmap, and just
as many for each socket's groups bitmaps while it's unlikely a regular
system right now will ever reach that limit.

I'll be posting some patches as replies.

johannes

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