• Jean Delvare's avatar
    [NET]: Clean up sk_buff walkers. · eefa3906
    Jean Delvare authored
    I noticed recently that, in skb_checksum(), "offset" and "start" are
    essentially the same thing and have the same value throughout the
    function, despite being computed differently. Using a single variable
    allows some cleanups and makes the skb_checksum() function smaller,
    more readable, and presumably marginally faster.
    
    We appear to have many other "sk_buff walker" functions built on the
    exact same model, so the cleanup applies to them, too. Here is a list
    of the functions I found to be affected:
    
    net/appletalk/ddp.c:atalk_sum_skb()
    net/core/datagram.c:skb_copy_datagram_iovec()
    net/core/datagram.c:skb_copy_and_csum_datagram()
    net/core/skbuff.c:skb_copy_bits()
    net/core/skbuff.c:skb_store_bits()
    net/core/skbuff.c:skb_checksum()
    net/core/skbuff.c:skb_copy_and_csum_bit()
    net/core/user_dma.c:dma_skb_copy_datagram_iovec()
    net/xfrm/xfrm_algo.c:skb_icv_walk()
    net/xfrm/xfrm_algo.c:skb_to_sgvec()
    
    OTOH, I admit I'm a bit surprised, the cleanup is rather obvious so I'm
    really wondering if I am missing something. Can anyone please comment
    on this?
    Signed-off-by: default avatarJean Delvare <jdelvare@suse.de>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    eefa3906
ddp.c 47.8 KB