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networking: add and use skb_put_u8()

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Joe and Bjørn suggested that it'd be nicer to not have the
cast in the fairly common case of doing
	*(u8 *)skb_put(skb, 1) = c;

Add skb_put_u8() for this case, and use it across the code,
using the following spatch:

    @@
    expression SKB, C, S;
    typedef u8;
    identifier fn = {skb_put};
    fresh identifier fn2 = fn ## "_u8";
    @@
    - *(u8 *)fn(SKB, S) = C;
    + fn2(SKB, C);

Note that due to the "S", the spatch isn't perfect, it should
have checked that S is 1, but there's also places that use a
sizeof expression like sizeof(var) or sizeof(u8) etc. Turns
out that nobody ever did something like
	*(u8 *)skb_put(skb, 2) = c;

which would be wrong anyway since the second byte wouldn't be
initialized.

Suggested-by: Joe Perches <joe@perches.com>
Suggested-by: Bjørn Mork <bjorn@mork.no>
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 14:29:24 +02:00
committed by David S. Miller
parent d58ff35122
commit 634fef6107
39 changed files with 106 additions and 100 deletions
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2
net/bluetooth/hci_sock.c
View File

@@ -517,7 +517,7 @@ static struct sk_buff *create_monitor_ctrl_open(struct sock *sk)
put_unaligned_le16(format, skb_put(skb, 2));
skb_put_data(skb, ver, sizeof(ver));
put_unaligned_le32(flags, skb_put(skb, 4));
*(u8 *)skb_put(skb, 1) = TASK_COMM_LEN;
skb_put_u8(skb, TASK_COMM_LEN);
skb_put_data(skb, hci_pi(sk)->comm, TASK_COMM_LEN);
__net_timestamp(skb);