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networking: make skb_push & __skb_push return void pointers

Selaa lähdekoodia 
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.

Make these functions return void * and remove all the casts across
the tree, adding a (u8 *) cast only where the unsigned char pointer
was used directly, all done with the following spatch:

    @@
    expression SKB, LEN;
    typedef u8;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    @@
    - *(fn(SKB, LEN))
    + *(u8 *)fn(SKB, LEN)

    @@
    expression E, SKB, LEN;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    type T;
    @@
    - E = ((T *)(fn(SKB, LEN)))
    + E = fn(SKB, LEN)

    @@
    expression SKB, LEN;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    @@
    - fn(SKB, LEN)[0]
    + *(u8 *)fn(SKB, LEN)

Note that the last part there converts from push(...)[0] to the
more idiomatic *(u8 *)push(...).

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2017-06-16 14:29:23 +02:00
committed by David S. Miller
vanhempi af72868b90
commit d58ff35122
126 muutettua tiedostoa jossa 204 lisäystä ja 234 poistoa
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4
drivers/nfc/fdp/i2c.c
Näytä tiedosto

@@ -79,8 +79,8 @@ static void fdp_nci_i2c_add_len_lrc(struct sk_buff *skb)
/* Add length header */
len = skb->len;
*skb_push(skb, 1) = len & 0xff;
*skb_push(skb, 1) = len >> 8;
*(u8 *)skb_push(skb, 1) = len & 0xff;
*(u8 *)skb_push(skb, 1) = len >> 8;
/* Compute and add lrc */
for (i = 0; i < len + 2; i++)