netdev - Re: [GIT PULL] [IPV6] COMPAT: Fix SSM applications on 64bit kernels.

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Date:	Fri, 25 Apr 2008 15:59:22 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	davem@...emloft.net
Cc:	dlstevens@...ibm.com, netdev@...r.kernel.org
Subject: Re: [GIT PULL] [IPV6] COMPAT: Fix SSM applications on 64bit
 kernels.

In article <20080424.234748.53723057.davem@...emloft.net> (at Thu, 24 Apr 2008 23:47:48 -0700 (PDT)), David Miller <davem@...emloft.net> says:

> From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@...ux-ipv6.org>
> Date: Fri, 25 Apr 2008 15:37:33 +0900 (JST)
> 
> > In article <20080424.233159.06679047.davem@...emloft.net> (at Thu, 24 Apr 2008 23:31:59 -0700 (PDT)), David Miller <davem@...emloft.net> says:
> > 
> > > 1) Use copy_in_user() as that's the proper interaface to copy within
> > >    userspace in COMPAT code.
> > 
> > So, don't we care increase of copy operation with it?
> 
> I think for now it's an OK tradeoff, but yes it does increase
> copies.  But then again, many compat layer handlers do.

And in IPv4, group_XXX{} handlers are even wrappers for ip_mreqXXX{}
handlers so we we have another copy...

--yoshfuji
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