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);
28
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