XXXX give me a better summary

*** 206,215 ****
--- 206,216 ----
  #define SA_NOT  0x01    /* Must have slot from swap dev other than input one */
  
  /* Special error codes for swap_newphysname() */
  #define SE_NOSWAP       -1      /* No physical swap slots available */
  #define SE_NOANON       -2      /* No anon slot for swap slot */
+ #define SE_NODEV        -3      /* No swap devices on this machine. */
  
  #ifdef _KERNEL
  extern struct anon *swap_anon(struct vnode *vp, u_offset_t off);
  extern int swap_phys_alloc(struct vnode **vpp, u_offset_t *offp, size_t *lenp,
      uint_t flags);