netdev - Re: [PATCH 1/9] mm: add a "struct subpage" type containing a page, offset and length

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Message-ID: <20111010155557.GA15503@infradead.org>
Date:	Mon, 10 Oct 2011 11:55:57 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	netdev@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/9] mm: add a "struct subpage" type containing a page,
 offset and length

On Mon, Oct 10, 2011 at 12:11:33PM +0100, Ian Campbell wrote:
> A few network drivers currently use skb_frag_struct for this purpose but I have
> patches which add additional fields and semantics there which these other uses
> do not want.
> 
> A structure for reference sub-page regions seems like a generally useful thing
> so do so instead of adding a network subsystem specific structure.

Subpage seems like a fairly bad name.  page_frag would fit into the
scheme used in a few other places.

The brings back the discussion of unifying the various incarnations we
have of this (biovec, skb frag and there were a few more at times),
but IIRC one of the sticking points back then was that one offset
insistet in 32-bit offset/len and the other on 16-bit.
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