net/core/kmap_skb.h

   1 #include <linux/highmem.h>
   2
   3 static inline void *kmap_skb_frag(const skb_frag_t *frag)
   4 {
   5 #ifdef CONFIG_HIGHMEM
   6         BUG_ON(in_irq());
   7
   8         local_bh_disable();
   9 #endif
  10         return kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ);
  11 }
  12
  13 static inline void kunmap_skb_frag(void *vaddr)
  14 {
  15         kunmap_atomic(vaddr, KM_SKB_DATA_SOFTIRQ);
  16 #ifdef CONFIG_HIGHMEM
  17         local_bh_enable();
  18 #endif
  19 }