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

*** 105,115 ****
  static void     segkpm_dump(struct seg *);
  static int      segkpm_pagelock(struct seg *seg, caddr_t addr, size_t len,
                          struct page ***page, enum lock_type type,
                          enum seg_rw rw);
  
! static struct seg_ops segkpm_ops = {
          .fault          = segkpm_fault,
          .dump           = segkpm_dump,
          .pagelock       = segkpm_pagelock,
  //#ifndef SEGKPM_SUPPORT
  #if 0
--- 105,115 ----
  static void     segkpm_dump(struct seg *);
  static int      segkpm_pagelock(struct seg *seg, caddr_t addr, size_t len,
                          struct page ***page, enum lock_type type,
                          enum seg_rw rw);
  
! static const struct seg_ops segkpm_ops = {
          .fault          = segkpm_fault,
          .dump           = segkpm_dump,
          .pagelock       = segkpm_pagelock,
  //#ifndef SEGKPM_SUPPORT
  #if 0