1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/mm.h>
 3#include <linux/slab.h>
 4
 5#define PGALLOC_GFP GFP_KERNEL | __GFP_ZERO
 6
 7static struct kmem_cache *pgd_cachep;
 8#if PAGETABLE_LEVELS > 2
 9static struct kmem_cache *pmd_cachep;
10#endif
11
12void pgd_ctor(void *x)
13{
14	pgd_t *pgd = x;
15
16	memcpy(pgd + USER_PTRS_PER_PGD,
17	       swapper_pg_dir + USER_PTRS_PER_PGD,
18	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
19}
20
21void pgtable_cache_init(void)
22{
23	pgd_cachep = kmem_cache_create("pgd_cache",
24				       PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
25				       PAGE_SIZE, SLAB_PANIC, pgd_ctor);
26#if PAGETABLE_LEVELS > 2
27	pmd_cachep = kmem_cache_create("pmd_cache",
28				       PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
29				       PAGE_SIZE, SLAB_PANIC, NULL);
30#endif
31}
32
33pgd_t *pgd_alloc(struct mm_struct *mm)
34{
35	return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
36}
37
38void pgd_free(struct mm_struct *mm, pgd_t *pgd)
39{
40	kmem_cache_free(pgd_cachep, pgd);
41}
42
43#if PAGETABLE_LEVELS > 2
44void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
45{
46	set_pud(pud, __pud((unsigned long)pmd));
47}
48
49pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
50{
51	return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
52}
53
54void pmd_free(struct mm_struct *mm, pmd_t *pmd)
55{
56	kmem_cache_free(pmd_cachep, pmd);
57}
58#endif /* PAGETABLE_LEVELS > 2 */

 
 1#include <linux/mm.h>
 2#include <linux/slab.h>
 3
 4#define PGALLOC_GFP GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO
 5
 6static struct kmem_cache *pgd_cachep;
 7#if PAGETABLE_LEVELS > 2
 8static struct kmem_cache *pmd_cachep;
 9#endif
10
11void pgd_ctor(void *x)
12{
13	pgd_t *pgd = x;
14
15	memcpy(pgd + USER_PTRS_PER_PGD,
16	       swapper_pg_dir + USER_PTRS_PER_PGD,
17	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
18}
19
20void pgtable_cache_init(void)
21{
22	pgd_cachep = kmem_cache_create("pgd_cache",
23				       PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
24				       PAGE_SIZE, SLAB_PANIC, pgd_ctor);
25#if PAGETABLE_LEVELS > 2
26	pmd_cachep = kmem_cache_create("pmd_cache",
27				       PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
28				       PAGE_SIZE, SLAB_PANIC, NULL);
29#endif
30}
31
32pgd_t *pgd_alloc(struct mm_struct *mm)
33{
34	return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
35}
36
37void pgd_free(struct mm_struct *mm, pgd_t *pgd)
38{
39	kmem_cache_free(pgd_cachep, pgd);
40}
41
42#if PAGETABLE_LEVELS > 2
43void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
44{
45	set_pud(pud, __pud((unsigned long)pmd));
46}
47
48pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
49{
50	return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
51}
52
53void pmd_free(struct mm_struct *mm, pmd_t *pmd)
54{
55	kmem_cache_free(pmd_cachep, pmd);
56}
57#endif /* PAGETABLE_LEVELS > 2 */