blob: 62c6101df260e60ddd1084804383d2831de67ba4 [file] [log] [blame]
Catalin Marinas1d18c472012-03-05 11:49:27 +00001/*
2 * PGD allocation/freeing
3 *
4 * Copyright (C) 2012 ARM Ltd.
5 * Author: Catalin Marinas <catalin.marinas@arm.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/mm.h>
21#include <linux/gfp.h>
22#include <linux/highmem.h>
23#include <linux/slab.h>
24
25#include <asm/pgalloc.h>
26#include <asm/page.h>
27#include <asm/tlbflush.h>
28
29#include "mm.h"
30
31#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
32
33pgd_t *pgd_alloc(struct mm_struct *mm)
34{
Catalin Marinas1d18c472012-03-05 11:49:27 +000035 if (PGD_SIZE == PAGE_SIZE)
Mark Rutland883d50a02014-02-05 10:24:13 +000036 return (pgd_t *)get_zeroed_page(GFP_KERNEL);
Catalin Marinas1d18c472012-03-05 11:49:27 +000037 else
Mark Rutland883d50a02014-02-05 10:24:13 +000038 return kzalloc(PGD_SIZE, GFP_KERNEL);
Catalin Marinas1d18c472012-03-05 11:49:27 +000039}
40
41void pgd_free(struct mm_struct *mm, pgd_t *pgd)
42{
43 if (PGD_SIZE == PAGE_SIZE)
44 free_page((unsigned long)pgd);
45 else
46 kfree(pgd);
47}