<linux/skbuff.h> has this (see also gcc.info on "Labels as values"):
extern __inline__ unsigned char *skb_put(struct sk_buff *skb, int len)
{
unsigned char *tmp=skb->tail;
skb->tail+=len;
skb->len+=len;
if(skb->tail>skb->end)
{
__label__ here;
panic("skput:over: %p:%d", &&here,len);
here:
}
return tmp;
}
> Also, does anything rely on the flag remaining unchanged over a call
> to cli()?
If you put "cc" in the clobber list, i.e.
__asm__ __volatile__ ("cli": : :"memory", "cc")
nothing should rely on the flag register.
olaf
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