2 * PGD allocation/freeing
4 * Copyright (C) 2012 ARM Ltd.
5 * Author: Catalin Marinas <catalin.marinas@arm.com>
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.
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.
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/>.
21 #include <linux/gfp.h>
22 #include <linux/highmem.h>
23 #include <linux/slab.h>
25 #include <asm/pgalloc.h>
27 #include <asm/tlbflush.h>
31 static struct kmem_cache *pgd_cache;
33 pgd_t *pgd_alloc(struct mm_struct *mm)
35 if (PGD_SIZE == PAGE_SIZE)
36 return (pgd_t *)__get_free_page(PGALLOC_GFP);
38 return kmem_cache_alloc(pgd_cache, PGALLOC_GFP);
41 void pgd_free(struct mm_struct *mm, pgd_t *pgd)
43 if (PGD_SIZE == PAGE_SIZE)
44 free_page((unsigned long)pgd);
46 kmem_cache_free(pgd_cache, pgd);
49 static int __init pgd_cache_init(void)
52 * Naturally aligned pgds required by the architecture.
54 if (PGD_SIZE != PAGE_SIZE)
55 pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE,
59 core_initcall(pgd_cache_init);