netdev - Re: [PATCH net-next] atm: use SKB_TRUESIZE() in atm_guess

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Message-ID: <1321994034.19663.9.camel@edumazet-laptop>
Date:	Tue, 22 Nov 2011 21:33:54 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	chas williams - CONTRACTOR <chas@....nrl.navy.mil>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] atm: use SKB_TRUESIZE() in
 atm_guess_pdu2truesize()

Le mardi 22 novembre 2011 à 15:22 -0500, chas williams - CONTRACTOR a
écrit :
> it doesnt seem like a good idea to create a wrapper for a one to one
> call.  perhaps this whole bit of nonsense should be removed.  the
> iphase driver should be returning skb->truesize like everyone.  
> 
> if atm_alloc_charge() just uses SKB_TRUESIZE() then we konw that guess
> will be the same as skb->truesize and atm_alloc_charge() can be
> simplified by removing atomic_add(skb->truesize - guess, which will be
> 0 in all cases.
> 

Please note I didnt create a wrapper, only correct existing one :)

Feel free to send a (tested) patch, but be warned that following code is
not correct :

int size = something;

struct sk_buff *skb = skb_alloc(size);

ASSERT(skb->truesize == SKB_TRUESIZE(size));

(It might be true with SLOB only)



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