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Date:	Fri, 29 Jun 2007 14:48:26 +0200
From:	Patrick McHardy <>
To:	Johannes Berg <>
CC:, Zhang Rui <>,,
	"linux-acpi@...r" <>,,
	Thomas Graf <>
Subject: Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

Johannes Berg wrote:
> On Fri, 2007-06-29 at 13:51 +0200, Patrick McHardy wrote:
>>Do multicast groups have to have a seperate name? Or would it suffice
>>to have them associated with the genl family and be able to find out
>>the starting group number? In that case something like
>>struct genl_mc_groups {
>>	struct genl_family *family or char *family_name or similar;
>>	unsigned int group_off;
>>	unsigned int group_num;
>>	unsigned long groups[];
>>seems to make more sense since you only need a single struct
>>per family.
> Hmm, another thought: since we have 32 bits for group numbers and 16
> bits for families we could just reserve 16 bits for groups within each
> family. Or do we get trouble with that because in some place there's a
> group bitmap or such?

Yes, af_netlink has a bitmap per socket that is subscribed to any group.
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