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