linux-kernel - Re: [PATCH 1/3] net: introduce a list of device addresses dev_addr

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Date:	Wed, 15 Apr 2009 13:22:32 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jiri Pirko <jpirko@...hat.com>
CC:	Eric Dumazet <dada1@...mosbay.com>, Li Zefan <lizf@...fujitsu.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jgarzik@...ox.com, davem@...emloft.net,
	shemminger@...ux-foundation.org, bridge@...ts.linux-foundation.org,
	fubar@...ibm.com, bonding-devel@...ts.sourceforge.net,
	mschmidt@...hat.com, ivecera@...hat.com
Subject: Re: [PATCH 1/3] net: introduce a list of device addresses	dev_addr_list

Jiri Pirko wrote:

>> Since you obviously need a write lock here to be sure following
>> can be done by one cpu only.
>>
>> You have same problem all over this patch.
> 
> Yes, as Dave wrote, this is guarded by RTNL mutex.

This was incorrect. IPv6 adds multicast addresses in softirq context.

>>> +
>>> +	ha = kzalloc(sizeof(*ha), GFP_ATOMIC);
>> kzalloc(max(sizeof(*ha), L1_CACHE_SIZE), GFP_...) is thus higly recommended here.
>>
>> Also, why GFP_ATOMIC is needed here ?
> 
> Yes, it is not needed here. I've copied it here from the original unicast and
> multicast add funtion to stay close but as I can see, there is no need for it
> there either.
> Noted.

Also needed for IPv6 in softirq context.

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