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net: add kerneldoc to skb_copy_bits()

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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: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-07-29 18:37:31 +00:00 committed by David S. Miller
parent 8fb4e13991
commit 22019b1782
1 changed files with 15 additions and 2 deletions
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17
net/core/skbuff.c
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@ -1369,8 +1369,21 @@ pull_pages:
}
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);