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#include <linux/mm.h>
#define PGALLOC_GFP GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO
static struct kmem_cache *pgd_cachep;
#ifdef CONFIG_PGTABLE_LEVELS_3
static struct kmem_cache *pmd_cachep;
#endif
void pgd_ctor(void *x)
{
pgd_t *pgd = x;
memcpy(pgd + USER_PTRS_PER_PGD,
swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
void pgtable_cache_init(void)
{
pgd_cachep = kmem_cache_create("pgd_cache",
PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
PAGE_SIZE, SLAB_PANIC, pgd_ctor);
#ifdef CONFIG_PGTABLE_LEVELS_3
pmd_cachep = kmem_cache_create("pmd_cache",
PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
PAGE_SIZE, SLAB_PANIC, NULL);
#endif
}
pgd_t *pgd_alloc(struct mm_struct *mm)
{
return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
}
void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
kmem_cache_free(pgd_cachep, pgd);
}
#ifdef CONFIG_PGTABLE_LEVELS_3
void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
set_pud(pud, __pud((unsigned long)pmd));
}
pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
}
void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
kmem_cache_free(pmd_cachep, pmd);
}
#endif /* CONFIG_PGTABLE_LEVELS_3 */
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