Commit | Line | Data |
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1d18c47c CM |
1 | /* |
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 | ||
2a0b5c0d CM |
29 | static struct kmem_cache *pgd_cache; |
30 | ||
1d18c47c CM |
31 | pgd_t *pgd_alloc(struct mm_struct *mm) |
32 | { | |
1d18c47c | 33 | if (PGD_SIZE == PAGE_SIZE) |
15670ef1 | 34 | return (pgd_t *)__get_free_page(PGALLOC_GFP); |
1d18c47c | 35 | else |
15670ef1 | 36 | return kmem_cache_alloc(pgd_cache, PGALLOC_GFP); |
1d18c47c CM |
37 | } |
38 | ||
39 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) | |
40 | { | |
41 | if (PGD_SIZE == PAGE_SIZE) | |
42 | free_page((unsigned long)pgd); | |
43 | else | |
2a0b5c0d CM |
44 | kmem_cache_free(pgd_cache, pgd); |
45 | } | |
46 | ||
39b5be9b | 47 | void __init pgd_cache_init(void) |
2a0b5c0d | 48 | { |
39b5be9b WD |
49 | if (PGD_SIZE == PAGE_SIZE) |
50 | return; | |
51 | ||
2a0b5c0d CM |
52 | /* |
53 | * Naturally aligned pgds required by the architecture. | |
54 | */ | |
39b5be9b WD |
55 | pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE, |
56 | SLAB_PANIC, NULL); | |
1d18c47c | 57 | } |