const-ify make segment ops structures
There is no reason to keep the segment ops structures writable.

*** 74,84 ****
  static int segspt_unmap(struct seg *seg, caddr_t raddr, size_t ssize);
  static void segspt_free(struct seg *seg);
  static void segspt_free_pages(struct seg *seg, caddr_t addr, size_t len);
  static lgrp_mem_policy_info_t *segspt_getpolicy(struct seg *seg, caddr_t addr);
  
! struct seg_ops segspt_ops = {
          .unmap          = segspt_unmap,
          .free           = segspt_free,
          .getpolicy      = segspt_getpolicy,
  };
  
--- 74,84 ----
  static int segspt_unmap(struct seg *seg, caddr_t raddr, size_t ssize);
  static void segspt_free(struct seg *seg);
  static void segspt_free_pages(struct seg *seg, caddr_t addr, size_t len);
  static lgrp_mem_policy_info_t *segspt_getpolicy(struct seg *seg, caddr_t addr);
  
! const struct seg_ops segspt_ops = {
          .unmap          = segspt_unmap,
          .free           = segspt_free,
          .getpolicy      = segspt_getpolicy,
  };
  
*** 110,120 ****
  static int segspt_shmpagelock(struct seg *, caddr_t, size_t,
                          struct page ***, enum lock_type, enum seg_rw);
  static int segspt_shmgetmemid(struct seg *, caddr_t, memid_t *);
  static lgrp_mem_policy_info_t *segspt_shmgetpolicy(struct seg *, caddr_t);
  
! struct seg_ops segspt_shmops = {
          .dup            = segspt_shmdup,
          .unmap          = segspt_shmunmap,
          .free           = segspt_shmfree,
          .fault          = segspt_shmfault,
          .faulta         = segspt_shmfaulta,
--- 110,120 ----
  static int segspt_shmpagelock(struct seg *, caddr_t, size_t,
                          struct page ***, enum lock_type, enum seg_rw);
  static int segspt_shmgetmemid(struct seg *, caddr_t, memid_t *);
  static lgrp_mem_policy_info_t *segspt_shmgetpolicy(struct seg *, caddr_t);
  
! const struct seg_ops segspt_shmops = {
          .dup            = segspt_shmdup,
          .unmap          = segspt_shmunmap,
          .free           = segspt_shmfree,
          .fault          = segspt_shmfault,
          .faulta         = segspt_shmfaulta,