提交 22019b17 编写于 作者: E Eric Dumazet 提交者: David S. Miller

net: add kerneldoc to skb_copy_bits()

Since skb_copy_bits() is called from assembly, add a fat comment to make
clear we should think twice before changing its prototype.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 8fb4e139
......@@ -1369,8 +1369,21 @@ unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta)
}
EXPORT_SYMBOL(__pskb_pull_tail);
/* Copy some data bits from skb to kernel buffer. */
/**
* skb_copy_bits - copy bits from skb to kernel buffer
* @skb: source skb
* @offset: offset in source
* @to: destination buffer
* @len: number of bytes to copy
*
* Copy the specified number of bytes from the source skb to the
* destination buffer.
*
* CAUTION ! :
* If its prototype is ever changed,
* check arch/{*}/net/{*}.S files,
* since it is called from BPF assembly code.
*/
int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len)
{
int start = skb_headlen(skb);
......
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