arch/mips/mm/pgtable.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  */
   6 #include <linux/export.h>
   7 #include <linux/mm.h>
   8 #include <linux/string.h>
   9 #include <asm/pgalloc.h>
  10
  11 pgd_t *pgd_alloc(struct mm_struct *mm)
  12 {
  13         pgd_t *init, *ret = NULL;
  14         struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM,
  15                         PGD_TABLE_ORDER);
  16
  17         if (ptdesc) {
  18                 ret = ptdesc_address(ptdesc);
  19                 init = pgd_offset(&init_mm, 0UL);
  20                 pgd_init(ret);
  21                 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  22                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  23         }
  24
  25         return ret;
  26 }
  27 EXPORT_SYMBOL_GPL(pgd_alloc);