text: #ifndef _LINUX_SCATTERLIST_H
  #define _LINUX_SCATTERLIST_H
  
  #include <asm/scatterlist.h>
  #include <linux/mm.h>
  #include <linux/string.h>
  
  static inline void sg_set_buf(struct scatterlist *sg, void *buf,
  			      unsigned int buflen)
  {
  	sg->page = virt_to_page(buf);
  	sg->offset = offset_in_page(buf);
  	sg->length = buflen;
  }
  
  static inline void sg_init_one(struct scatterlist *sg, void *buf,
  			       unsigned int buflen)
  {
  	memset(sg, 0, sizeof(*sg));
  	sg_set_buf(sg, buf, buflen);
  }
  
  #endif /* _LINUX_SCATTERLIST_H */
  