Although this may just be a case of "it's fugly, kill it".
In net/core/skbuff.c (2.6.21-rc7-mm1), we have:
memcpy(data + nhead, skb->head,
#ifdef NET_SKBUFF_DATA_USES_OFFSET
skb->tail);
#else
skb->tail - skb->head);
#endif
and sparse says:
net/core/skbuff.c:651:2: error: unmatched #else within stream
net/core/skbuff.c:653:2: error: unmatched #endif in stream
net/core/skbuff.c:648:2: error: Expected ) in expression
net/core/skbuff.c:648:2: error: got #
net/core/skbuff.c:648:2: error: Expected ) in function call
net/core/skbuff.c:648:2: error: got #
net/core/skbuff.c:648:2: error: Expected ; at end of statement
net/core/skbuff.c:648:2: error: got __ret
net/core/skbuff.c:652:24: error: Expected ; at end of statement
net/core/skbuff.c:652:24: error: got )
net/core/skbuff.c:648:2: error: undefined identifier 'else'
net/core/skbuff.c:652:13: error: incompatible types for operation (-)
net/core/skbuff.c:652:13: left side has type unsigned int [unsigned]
[usertype] tail
net/core/skbuff.c:652:13: right side has type unsigned char *head
---
~Randy
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